Best 20 Onion Tart Recipes

TARTE FLAMBEE (ALSATIAN BACON & ONION TART)

Steps:

• Place bacon in a skillet and cook over medium-high heat until cooked but not crisp and fat has rendered out, about 8 minutes. Drain in a strainer; reserve the fat.
• Place skillet back over medium heat. Add sliced onions. Cook briefly just until they lose their raw edge and soften up slightly, 3 to 5 minutes. Add a teaspoon or 2 of bacon fat if pan seems too dry. Remove skillet from heat and allow to cool to room temperature.
• Mix fromage blanc, creme fraiche, nutmeg, salt, black pepper, and cayenne pepper together in a mixing bowl.
• Place 1 ball of pizza dough on a well-floured surface. Flatten and roll out to a 10- or 12-inch thin circle. Transfer to a cold cast iron pan. Heat over medium-high heat to pre-cook the bottom of the crust. As dough heats and bubbles appear, deflate them with the tines of a fork so crust ends up thin and crisp (not chewy). When bottom is nicely browned and just about to start getting charred, 5 to 7 minutes, remove from heat. Repeat with remaining dough.
• Spread a generous amount of cheese mixture over the crust. Top evenly with some onions and then the bacon. Broil 5 or 6 minutes until edges are browned and starting to lift. Repeat for remaining tartes.

ALSACE ONION TART

Steps:

• Make pastry:
• Blend together flour, butter, shortening, and salt in a bowl with your fingertips or a pastry blender (or pulse in a food processor) just until most of mixture resembles coarse meal with some small (roughly pea-size) butter lumps. Drizzle evenly with 4 tablespoons ice water and gently stir with a fork (or pulse in processor) until incorporated.
• Squeeze a small handful: If it doesn't hold together, add more ice water, 1/2 tablespoon at a time, stirring (or pulsing) until just incorporated, then test again. (Do not overwork mixture, or pastry will be tough.)
• Turn out mixture onto a lightly floured surface and divide into 6 equal portions. With heel of your hand, smear each portion once or twice in a forward motion. Gather dough together with pastry scraper and press into a ball, then flatten into a disk. Chill dough, wrapped in plastic wrap, until firm, at least 1 hour.
• Roll out dough on a floured surface with a floured rolling pin into a 14-inch round and fit into tart pan. Trim excess dough, leaving a 1/2-inch overhang, then fold overhang over pastry and press against side to reinforce edge. Lightly prick bottom with a fork and chill until firm, about 30 minutes.
• Put oven rack in middle position and preheat oven to 400°F.
• Line chilled shell with foil and fill with pie weights. Bake until pastry is set and pale golden along rim, 15 to 20 minutes. Carefully remove foil and weights and bake shell until golden all over, 10 to 15 minutes more. Transfer shell to a rack. (Leave oven on.)
• Prepare filling while shell bakes:
• Cook bacon in a 12-inch nonstick skillet over moderate heat, stirring occasionally, until crisp, 6 to 8 minutes. Transfer bacon with a slotted spatula to paper towels to drain and pour off bacon fat. Add butter to skillet and cook onions with 3/4 teaspoon salt and 1/2 teaspoon pepper over moderate heat, stirring, until just wilted, about 2 minutes. Cover surface of onions with a round of parchment or wax paper (or cover skillet with a tight-fitting lid) and continue to cook, lifting parchment to stir frequently, until onions are very soft and pale golden, about 20 minutes. Stir in bacon, then remove from heat and cool 10 minutes.
• Whisk together crème fraîche, eggs, nutmeg, remaining 1/2 teaspoon salt, and remaining 1/2 teaspoon pepper in a large bowl, then stir in onions.
• Fill and bake tart:
• Pour filling into tart shell, spreading onions evenly, and bake until filling is set and top is golden, 25 to 35 minutes. Serve warm or at room temperature.

CARAMELIZED ONION TART

Steps:

• Thaw the pastry sheet at room temperature for 40 minutes or until it's easy to handle. Heat the oven to 400 degrees F. Line a baking sheet with parchment paper or spray with vegetable cooking spray.
• Heat the oil in a 12-inch skillet over medium heat. Add the onion and cook for about 15 minutes or until golden, stirring often. Season to taste and let cool.
• Unfold the pastry sheet on a lightly floured surface. Roll into a 12-inch square. Place on the prepared baking sheet. Brush the edges of the square with water. Fold over the edges 1/2 inch on all sides, pressing firmly with a fork to form a rim. Prick the pastry thoroughly with a fork.
• Spread the onion mixture over the pastry crust. Top with the gruyere and parmesan cheeses and sprinkle with the chives.
• Bake for 20 minutes or until golden and bubbly. Cool for 5 minutes on a wire rack. Cut into approximately 3 x 2-inch rectangles. Serve warm.

CARAMELIZED ONION POTATO TART

Steps:

• Preheat oven to 350 degrees F.
• Set a large skillet over medium heat and add 4 tablespoons of olive oil. Add sliced onions and cook over medium heat for 10 to 12 minutes until they are tender and brown all over.
• Using a mandolin (or sharp knife), finely slice the potatoes into rounds (you can place them in a bowl with a wet towel over the top to stop them from going brown while you work). Place the potatoes into a bowl and season with salt and pepper. When ready, add the onions and toss to combine without breaking potatoes.
• Add about 1 tablespoon water to the same pan the onions were cooked in and allow it to come to a bubble. Using layered paper towels, wipe the pan clean.
• Add some extra-virgin olive oil to the pan and add the potatoes to the pan, making sure the potatoes are flat. Top with the diced butter.
• Take a piece of parchment paper and fold in half. Find the middle of the parchment along the crease and hold in place with your finger. Taking the right side of the parchment, pull it towards the center and fold it straight down to create a diagonal edge. Fold the parchment in half to create a triangle. Place the pointed edge in the middle of the saute pan on top of the potatoes to find its radius. Make a marker of where the pan edge ends (or starts). At this point you can cut the parchment at this marker and open to reveal a circle.
• Cover the potatoes with the parchment paper and press down. Drizzle some extra-virgin olive oil over the top so it down burn and rub it in.
• Place the pan into the oven on the top rack and bake for about 45 minutes.
• When done remove from oven and run a knife around the edge to separate from the pan. Place a large plate on top of the saute pan and flip. Remove the saute pan. Allow to cool slightly before cutting into slices.

FRENCH ONION TART

Steps:

• Preheat the oven to 400 degrees F. Line a baking sheet with parchment paper.
• On a work surface, roll the puff pastry into a roughly 10 by 16-inch rectangle. With a sharp knife, trim uneven edges to make a perfect rectangle. Evenly cut off the outer 1 inch of each side of the rectangle in strips; put the puff sheet on the baking sheet. Dip your finger in water and run around the top edges of the rectangle and replace the removed strips of pastry along the edges of the sheet, pressing lightly to adhere. With a fork, pierce the interior of the tart shell to prevent rising; do not pierce the adhered edges. Bake until the outer edges have puffed and are golden in color; about 15 minutes. Set aside.
• Heat 2 tablespoons olive oil in a large skillet over medium-low heat. Add onions and thyme sprigs and season well with salt and pepper, to taste. Cook, stirring occasionally, until the onions begin to brown. Add the stock, a tablespoon at a time, as the pan gets dry, scraping and stirring the brown bits that are stuck to the bottom oft the pan. When the onions are caramelized to a dark golden color, remove from the heat and discard the leafless thyme sprigs (the leaves fall off while cooking).
• When ready to serve, preheat the oven to 350 degrees F. Evenly spread the caramelized onions on the cooked pastry shell and heat in the oven until warmed through, 5 to 7 minutes. Remove from oven, to a cutting board and cut into wedges. Arrange on a serving platter and garnish each wedge with a sprig of fresh thyme. Serve immediately and enjoy!

ONION, CHEESE, AND BACON TART

Steps:

• For crust:
• Blend flour and salt in processor. Add butter and shortening; using on/off turns, cut in until mixture resembles coarse meal. Add 2 tablespoons ice water and process until moist clumps form, adding more ice water by teaspoonfuls if dough is dry. Gather dough into ball; flatten into disk. Wrap in plastic and chill at least 1 hour.
• Preheat oven to 400°F. Roll out dough on lightly floured work surface to 11-inch round. Transfer to 9-inch tart pan with removable bottom. Press dough onto bottom and up sides of pan. Pierce crust all over with fork. Freeze 10 minutes. Line crust with foil; fill with dried beans or pie weights. Bake crust 10 minutes. Remove foil and beans. Bake until crust is set and partially cooked through, about 15 minutes longer. Cool crust while making filling. Maintain oven temperature.
• For filling:
• Sauté bacon in medium skillet over medium heat until crisp, about 4 minutes. Transfer bacon to paper towels to drain. Add onion and pinch of sugar to drippings in skillet and sauté until onion is deep golden brown, about 20 minutes. Whisk cream, egg, egg yolk, pepper, salt, and nutmeg in small bowl to blend. Spread onion over bottom of baked crust; sprinkle bacon over, then cheese. Pour cream mixture over.
• Bake until tart is puffed and filling is set, about 25 minutes. Cool tart on rack 10 minutes. Remove pan sides. Serve warm or at room temperature.

TOMATO, GOAT CHEESE, AND ONION TART

Steps:

• Preheat oven to 375°F.
• If necessary, roll out dough on a lightly floured surface into an 11-inch round and fit into tart pan. Trim excess dough, leaving a 1/2-inch overhang, then fold overhang inward and press against side of pan to reinforce edge. Lightly prick bottom and sides with a fork.
• Line tart shell with foil and fill with pie weights. Bake in middle of oven until pastry is pale golden around rim, about 20 minutes. Carefully remove weights and foil and bake until golden all over, 8 to 10 minutes more. Cool in pan on a rack.
• While tart shell is baking, heat 2 tablespoons oil in a 12-inch heavy skillet over moderate heat, then cook onion with salt and black pepper to taste, stirring frequently, until golden brown, 15 to 20 minutes.
• Preheat broiler.
• Spread onion over bottom of tart shell and top with 1 rounded cup goat cheese. Arrange tomatoes, slightly overlapping, in concentric circles over cheese. Sprinkle with remaining cheese and salt and pepper to taste and drizzle with remaining tablespoon oil. Put foil over edge of crust (to prevent overbrowning).
• Put tart pan on a baking sheet and broil tart about 7 inches from heat until cheese starts to brown slightly, 3 to 4 minutes.

ONION TART

Steps:

• Preheat oven to 350 degrees F (175 degrees C).
• In a large skillet, melt butter and saute onions until soft. Remove from heat. Place bacon in a large, deep skillet. Cook over medium high heat until evenly brown. Drain, crumble and set aside.
• Mix in eggs.
• Pour into prepared shell and bake at 350 degrees F (175 degrees C) for approximately 20 minutes. Top with bacon, Can be served warm or cold.

ONION TART

Steps:

• Line unpricked pastry shell with a double thickness of heavy-duty foil. Bake at 450° for 8 minutes. Remove foil; bake 5 minutes longer. Cool on a wire rack. , In a small skillet, saute onions in oil until tender; cool. In a food processor, combine the eggs, feta cheese, salt, pepper, nutmeg and hot pepper sauce; cover and process until smooth. Gradually add cream and milk; process until blended., Brush the inside of crust with mustard. Sprinkle the green onions, chives and sauteed onions over crust. Carefully pour egg mixture over onions. Top with Parmesan cheese. , Bake at 375° for 30-40 minutes or until a knife inserted in the center comes out clean.

ANDRE'S ONION TART

Steps:

• Butter a 10-inch tart pan with removable bottom; set aside.
• Make the crust: In a medium bowl, combine flour and 1/2 teaspoon salt. Add 8 tablespoons (1 stick) chilled butter, and combine with fingers or a pastry blender until it has the texture of coarse meal. Add 1/2 cup ice water, and stir just until a dough forms. Form into a disk, and wrap in plastic wrap. Chill for at least 15 minutes.
• Preheat oven to 375 degrees. On a lightly floured surface, roll out dough to 1/8-inch-thick round. Fit dough into prepared tart pan; trim excess. Line with a parchment paper round, and fill with pie weights. Chill for 15 minutes. Transfer to oven, and bake for 15 minutes. Remove pie weights and parchment paper. Bake for 5 minutes more. Remove from oven, and set aside.
• In a large skillet, heat remaining 4 tablespoons butter. Add onions, and cook, stirring frequently, until slightly browned and softened, about 15 minutes. Remove from heat.
• In a small bowl, combine beaten egg, cream, remaining 1 teaspoon salt, pepper, and nutmeg. Stir in onions.
• Sprinkle baked tart shell with cheese. Spread onion mixture evenly over cheese. Bake until set, 35 to 40 minutes. Serve immediately.

CARAMELIZED ONION TART WITH OLIVES

Steps:

• Preheat oven to 425 degrees. Melt butter with oil in a skillet over medium-high heat. Add onions and thyme, and cook until onions are golden and soft, about 10 minutes.
• On a lightly floured surface, roll out pastry, and trim to an 8 1/2-by-15-inch rectangle. Place on a parchment-lined baking sheet, transfer to oven, and immediately reduce oven to 400. Bake until pastry begins to rise, about 12 minutes.
• Arrange onions in a single layer over pastry, leaving a 1-inch border around edge. Top with olives and anchovies if using. Bake for 15 minutes. Reduce oven to 375 degrees, and bake until puffed and golden brown, about 15 minutes more (tent with foil if crust browns too quickly). Cut into squares.

ROASTED BUTTERNUT SQUASH AND CARAMELIZED ONION TART

Steps:

• On a lightly floured surface roll out dough into a 12-inch round (about 1/8 inch thick). Fit dough into an 11-inch tart pan with a removable fluted rim. Freeze shell 15 minutes.
• Preheat oven to 375°F.
• Line shell with foil and fill with pie weights or raw rice. Bake shell in middle of oven until edge is pale golden, about 20 minutes. Carefully remove foil and weights or rice and bake shell 10 minutes more, or until bottom is golden. Leave oven on. Cool shell in pan on a rack.
• Halve squash and scoop out seeds. Lightly brush each cut side with about 1 teaspoon oil and on a baking sheet roast squash, cut sides down, in middle of oven 40 minutes, or until soft.
• While squash is roasting, thinly slice onion and in a heavy skillet cook in 1/2 tablespoon butter and remaining 1 1/2 teaspoons oil over moderate heat, stirring occasionally, until soft and golden brown, about 20 minutes.
• Cool squash and scoop out flesh. In a food processor purée squash. Add whole egg, egg yolk, and cream and blend well. Transfer mixture to a large bowl and stir in cheeses, herbs, onion, salt, and pepper to taste. Pour filling into shell, smoothing top.
• In a small skillet melt remaining tablespoon butter and stir in bread crumbs until combined well. Sprinkle bread crumb mixture evenly over filling. Bake tart in middle of oven 40 minutes, or until filling is set. Cool tart in pan on rack 10 minutes and carefully remove rim.

TOMATO AND ONION TART

Steps:

• In a large heavy skillet cook onions with salt to taste in oil, covered, over moderate heat, stirring occasionally, until softened, about 20 minutes. Remove lid and cook onions, stirring occasionally, until golden and any liquid evaporates. Remove skillet from heat to cool onions slightly.
• Preheat oven to 375°F.
• On a lightly floured surface with a floured rolling pin roll dough into a 14-inch round (about 1/8 inch thick). Fold round in half and transfer to a 12-inch tart pan with a removable fluted rim or a 12-inch quiche dish. Unfold dough, easing to fit, and trim overhang to 3/4 inch. Fold overhang toward center and press against side of pan or dish. Spread onion mixture over dough and top with cheese. Arrange tomato wedges and olives in concentric circles over cheese and season with salt and pepper.
• Bake tart in middle of oven 1 hour, or until pastry is golden, and cool on a rack. Remove rim of pan if necessary.
• Serve tart warm or at room temperature.

SPINACH AND ONION TART

Steps:

• Preheat the oven to 350 degrees. Oil a 10-inch tart pan and line it with the pastry. Keep it in the refrigerator while you prepare the filling.
• Steam the spinach above an inch of boiling water for 2 to 3 minutes, until wilted. You will probably have to do this in batches. I like to use a pasta pot with an insert for steaming spinach, as I can get a lot of it into the insert. Rinse briefly with cold water, squeeze out excess water and chop medium-fine.
• Heat the olive oil over medium heat in a large, heavy skillet and add the onion. Cook, stirring often, until it is tender and beginning to color, about 8 minutes. Add the spinach, thyme and salt and pepper to taste, and stir together. Remove from the heat.
• Whisk the eggs in a large bowl. Add salt to taste (I use about 1/2 teaspoon) and whisk in the milk. Stir in the onion and spinach mixture and the cheeses. Scrape into the pastry-lined tart pan. Place in the oven and bake 40 to 45 minutes, until tart is set and beginning to color on the top. Remove from the heat and allow to cool for at least 15 minutes before cutting. Serve warm or room temperature.

ALSATIAN ONION TART

Steps:

• Sift the flour into a large bowl then rub in the butter with your (clean) fingers until the mixture resembles fine breadcrumbs.
• Mix the egg yolks with the salt and 3 tablespoons water. Stir into the flour, using a knife, to make a soft and smooth (but not sticky) dough. Add the extra tablespoon of water if the mixture is too dry.
• Pat the dough into a ball, wrap up in cling film and refrigerate for 30 minutes.
• Preheat the oven to 220C/425°F.
• Roll out the pastry on a floured surface and use to line a 10-inch tart pan.
• Prick the pastry all over with a fork and bake blind for 10-12 minutes. Remove from oven and let cool.
• Lower the temperature of the oven to 190C/375F and place a baking sheet in the oven to heat.
• Heat the oil in a non-stick frying pan. Add the onions, bay leaf, thyme, salt and pepper. Cover and cook gently until the onions are soft and transparent, stirring occasionally.
• Add the wine and simmer, uncovered, until all the liquid has evaporated.
• Remove the bay leaf and taste for seasoning.
• Whisk the eggs and cream together.
• Spread the onions into the pastry crust and pour in the egg mixture.
• Place on the hot baking sheet and bake for 15 minutes.
• May be served hot or room temperature.

CARAMELIZED ONION AND ROASTED RED PEPPER TART

Steps:

• Dough:.
• Dissolve yeast and honey in warm water in a large bowl; let stand for 5 minutes.
• Lightly spoon flours into dry measuring cups, and level with a knife. Stir 1 cup bread flour and 1 tablespoon oil into yeast mixture. Cover and let rise in a warm place (85°F), free from drafts, 1 1/2 hours or until bubbly.
• Stir in 1/2 cup bread flour, whole wheat flour, and 1 teaspoon salt.
• Turn dough out onto a floured surface. Knead until smooth and elastic (about 10 minutes); dough will feel tacky. Place dough in a large bowl coated with cooking spray, turning to coat top. Cover and let rise in a warm place (85°), free from drafts, for 1 hour or until doubled in size. (Press two fingers into the dough. If indentation remains, the dough has risen enough.) Punch dough down; cover and let rest 10 minutes.
• Topping:.
• Heat 1 tablespoon oil in a 12-inch nonstick skillet coated with cooking spray over medium-high heat. Add onion, and cook for 5 minutes, stirring frequently. Stir in 1 teaspoon salt, thyme sprigs, garlic, and bay leaves; cook for 15 minutes or until deep golden brown, stirring frequently.
• Remove from heat. Discard thyme sprigs and bay leaves.
• Preheat broiler.
• While onion is cooking, cut bell peppers in half lengthwise, discarding seeds and membranes. Place the pepper halves, skin sides up, on a foil-lined baking sheet; flatten with hand. Broil for 15 minutes or until blackened. Place in a zip-top plastic bag, and seal. Let stand for 15 minutes. Peel and coarsely chop.
• Preheat oven to 425°F.
• Roll the dough into a 12 x 8-inch rectangle. Place the dough on a baking sheet coated with cooking spray. Top with the onion mixture and the chopped bell pepper. Sprinkle with black pepper. Bake at 425°F for 25 minutes or until the crust is golden brown. Cool slightly. Sprinkle with chopped thyme. Cut into 8 squares, and cut each square in half diagonally. Garnish with thyme sprigs, if desired.

PISSALADIERE (PROVENCAL ONION TART)

Steps:

• In workbowl of food processor fitted with plastic dough blade (can use metal blade if necessary), pulse flour, yeast, and salt to combine, about five 1 second pulses. With machine running, slowly add oil, then water, through feed tube; continue to process until dough forms ball, about 15 seconds.
• Generously dust work surface with flour. Using floured hands, transfer dough to work surface and knead lightly, shaping dough into ball.
• Lightly oil 1 quart measuring cup or small bowl, place dough in measuring cup, cover tightly with plastic wrap, and set aside in draft-free spot until doubled in volume, 1 to 1 1/2 hours.
• While dough is rising, heat oil in 12 inch nonstick skillet over high heat until shimmering but not smoking. Stir in onions, garlic, salt, and brown sugar and cook, stirring frequently, until moisture released by onions has evaporated and onions begin to brown, about 10 minutes.
• Reduce heat to medium-low and cook, stirring frequently. After 15 minutes, remove garlic cloves, mince them and then return them to the pan, along with the balsamic vinegar. Stir and continue cooking for 5 more minutes, until onions have softened and are medium to golden brown. Off heat, stir in water; transfer to bowl and set aside.
• When dough has doubled, adjust oven rack to lowest position, set baking stone on rack, and heat oven to 500°F.
• Remove dough from measuring cup and divide into 2 equal pieces using dough scraper. Working with one piece at a time, form each piece into rough ball by gently pulling edges of dough together and pinching to seal. With floured hands, turn dough ball seam-side down. Cupping dough with both hands, gently push dough in circular motion to form taut ball. Repeat with second piece.
• Brush each lightly with oil, cover with plastic wrap, and let rest 10 minutes. Meanwhile, cut two 20 inch lengths parchment paper and set aside.
• Coat fingers and palms of hands generously with oil. Using dough scraper, loosen 1 piece of dough from work surface. With well-oiled hands, hold dough aloft and gently stretch to 12-inch length (like a very large breadstick). Place on parchment sheet and gently dimple surface of dough with fingertips. Using oiled palms, push and flatten dough into 14x8 inch oval.
• Brush dough with oil and sprinkle with 1/4 teaspoon pepper. Leaving 1/2 inch border around edge, sprinkle 1/4 cup olives, 1 tablespoon chopped anchovies, and 1 teaspoon thyme evenly over dough, then evenly scatter with half of onions. Sprinkle with fennel seeds and marjoram, if using.
• Slip parchment with tart onto pizza peel (or inverted rimless baking sheet), then slide onto hot baking stone. Bake until deep golden brown, 13 to 15 minutes. While first tart bakes, shape and top second tart.
• Remove tart from oven with peel or pull parchment onto baking sheet; transfer tart to cutting board and slide parchment out from under tart. Cool 5 minutes; sprinkle with 1 1/2 teaspoons parsley, if using. Cut tart in half lengthwise, then cut crosswise to form 8 pieces; serve immediately. While first tart cools, bake second tart.

CHEESE AND ONION TART

Steps:

• For crust: Preheat oven to 400F.
• Combine flour and salt and cut in butter and Crisco until mixture resembles coarse meal.
• Add 3 tblsps ice water and combine until it forms a ball.
• Flatten into a 6 inch disk and chill it, wrapped in plastic wrap, for 1 hour.
• Roll out to 1/8 inch thick on lightly-floured surface and fit into a 9 inch tart pan.
• Trim edge and prick all over with a fork.
• Bake in middle of oven for 10 minutes.
• Let cool.
• Maintain oven temperature.
• For filling: Cook onion in butter over moderately-low heat until softened.
• Mash blue cheese with half and half and stir in eggs, Cheddar, onion and salt and pepper to taste.
• Pour into shell and bake for 10 minutes.
• Reduce oven temperature to 350F and bake 25 minutes longer.

SAVORY MUSHROOM, ONION, AND BACON PUFF PASTRY TART

Steps:

• Preheat the oven to 400 degrees F (200 degrees C).
• Unroll puff pastry onto a baking sheet. Score edges at 1/4-inch intervals using a paring knife or press edges using a fork. Return pastry to the freezer until you're ready to use it.
• Heat a large skillet over high heat. Add 1 tablespoon oil and heat for 1 minute. Reduce heat to medium-high. Add bacon and cook until crisp around the edges but stiff soft in the center, 3 to 4 minutes. Reduce heat to low. Add onions, mushrooms, and thyme. Sprinkle with 1/4 teaspoon salt to help vegetables release water. Cook, stirring often, until vegetables begin to wilt and most of the water has evaporated, 5 to 7 minutes. Season with black pepper to taste. Remove from heat and transfer mixture to a platter.
• Place ricotta cheese in a bowl. Beat in egg yolk and remaining oil until smooth. Season with salt and black pepper. Spread ricotta mixture to within 1/2-inch of the edges of the puff pastry. Sprinkle Gruyere cheese on top, then cover with mushroom mixture.
• Bake in the preheated oven until crust is golden brown and crisp, 20 to 25 minutes.

ZWIEBELKUCHEN (SAVORY BACON-AND-ONION TART)

Steps:

• Place milk and 4 tablespoons butter in a small saucepan, and heat until butter has melted. Remove pan from heat, and let mixture cool until tepid.
• Place milk mixture in the bowl of an electric mixer fitted with the paddle attachment. On low speed, add the sugar, 1/2 teaspoon salt, lemon zest, egg yolks, and yeast. Gradually add 3 cups flour, creating a dough that is soft but not sticky.
• Turn dough out onto a floured surface, and knead until it is smooth and elastic and springs back when you poke it with your finger, about 5 minutes. Place in a large buttered bowl, and cover tightly with plastic wrap. Set in a warm place until dough has doubled in bulk, about 1 hour.
• Heat oven to 400 degrees. Line an 11-by-17-inch baking sheet with parchment. Punch dough down, and roll out to a 1/4-inch thickness. Place on prepared baking sheet, and cover with buttered plastic wrap; let rise until dough doesn't spring back when you poke it with your finger, about 20 minutes.
• Melt remaining tablespoon butter in a large skillet over medium heat. Add the bacon, and cook until golden and crisp and most of fat has been rendered, about 6 minutes. Add onions, and cook, stirring occasionally, until translucent, 8 minutes. Reduce heat to low. Sprinkle 1 1/2 teaspoons flour over onions, and stir in. In a small bowl, whisk together sour cream and the egg, and stir into the onion mixture. Cook, stirring, until mixture thickens, about 1 minute. Remove skillet from heat, and season with salt.
• Spread mixture on top of dough, and let rise 15 minutes more. Sprinkle top with caraway seeds. Bake until edges are crisp and brown, about 30 minutes. Transfer to a wire rack to cool, and serve. Bread will keep, wrapped and unrefrigerated, up to 4 days.