VERY FRESH LEMON TART - FRENCH TARTE AU CITRON

Steps:

• To prepare the filling, combine all of the ingredients, cover, and let sit in the refrigerator overnight. Before finishing the tart, take the filling out of the refrigerator and allow it to come to room temperature.
• To make the pastry, mix the dry ingredients in a bowl. Add the butter and combine by hand, rubbing the butter into the flour mixture, until it all starts to come together but is still slightly lumpy. Add the egg and just enough cream to bring the mixture together into a smooth dough with some streaks of butter still visible. Form into a ball, wrap in plastic, and refrigerate for at least 1 hour.
• Preheat the oven to 350ºF(175ºC). Grease and flour a 10-inch tart pan with a removable bottom. Roll out the dough to a thickness of 1/8 to 1/4 inch and transfer to the prepared tart pan. Line with aluminum foil, weigh down with pie weights or beans, and bake for about 20 minutes. Remove the weights and foil and bake for an additional 15 to 20 minutes, until the tart shell is cooked through and golden.
• Lower the oven temperature to 300ºF(150ºC). Stir the room-temperature filling to combine. Pour the filling into the baked shell and bake until set, about 20 minutes. Remove from the oven, cool to room temperature, and chill before cutting.