MAPLE FLAN IN A WALNUT CRUST

Steps:

• 1. To prepare the flan, place the maple syrup in a large, heavy saucepan. Set it over low heat and let simmer until the syrup is reduced by a quarter (to 3/4 cup), 15 to 20 minutes.
• 2. Add the cream to the syrup and stir until mixture is smooth and comes back to a simmer.
• 3. In a large bowl, whisk the egg yolks until smooth. Add a little of the hot maple cream into the eggs to warm them, whisking constantly to keep the yolks from curdling. Pour the mixture into the saucepan, whisking the cream constantly. Strain the mixture into a bowl, stir in the salt, and chill for at least 2 hours and up to 5 days.
• 4. Preheat oven to 300°F. Place 1/4 cup water in a small saucepan over medium heat, then add the sugar and corn syrup. Raise the heat to high and cook, swirling the pan occasionally, until the mixture becomes a dark amber caramel, 7 to 10 minutes. Immediately pour the caramel into an 8-inch round nonstick cake pan, tilting to make sure the sides are well coated. Work quickly so the caramel doesn't harden. If it does, rewarm it over low heat.
• 5. Pour the maple custard into the caramel-coated cake pan. Place it in a baking pan and carefully move it to the oven rack. Pour enough very hot water into the baking pan to reach two thirds of the way up the side of the cake pan. Cover the baking pan with foil and prick all over with a fork. Bake the flan for about 1 hour, then lift off a corner of the foil to vent the steam. Re-cover the pan and continue to bake until the flan is set around the edges but still slightly jiggly in the center, about 45 minutes longer. Remove the flan from the baking pan and transfer to a rack. Let cool at room temperature, then cover and refrigerate overnight.
• 6. To prepare the walnut crust, preheat oven to 350°F. Spread the nuts out on a baking sheet and toast them in the oven, stirring once or twice, until they smell nutty, about 10 minutes. Transfer the pan to a wire rack to cool.
• 7. Using a food processor, pulse the walnuts until they are finely ground, then reserve. In the bowl of an electric mixer fitted with the paddle attachment, beat the butter and confectioners' sugar until combined, about 1 minute. Beat in the egg. In a medium bowl, whisk together the flour, almond flour, walnuts, and salt. Add the flour mixture to the butter mixture in 2 batches, scraping down the sides of the bowl between additions. Mix until the dough just holds together. Scrape the dough onto a piece of plastic wrap and form it into a disk. Wrap it and chill for at least 1 hour, until firm.
• 8. Preheat oven to 325°F. On a lightly floured surface, roll out the dough 1/8 inch thick into a 12-inch round. Fit the dough into a 9-inch quiche pan. Trim away any excess dough, then use a fork to prick the crust all over. Bake the tart crust until it's pale golden, about 25 minutes. Transfer the pan to a wire rack to cool. (The tart shell can be made 8 hours ahead and kept at room temperature or frozen.)
• 9. To unmold the flan, run a small knife around the sides of the cake pan, then invert the flan into the baked tart shell. Serve with whipped crème fraîche, if desired.
• Variation
• For individual flans without crust, divide the caramel and then the maple custard evenly among eight 4-ounce glass or ceramic ramekins. Bake as directed for 1 hour and 30 minutes, venting the steam after 45 minutes.