01 - Preheat oven to 350°F.
02 - In a food processor, combine flour, powdered sugar, and salt. Pulse to blend.
03 - Add cold, cubed butter and pulse until the mixture resembles coarse crumbs.
04 - Add egg yolk and 2 tablespoons cold water. Pulse until dough begins to form, adding an additional tablespoon water if needed.
05 - Turn the dough onto a lightly floured surface. Shape into a disk, wrap, and refrigerate for 30 minutes.
06 - Roll the dough to 1/8-inch thickness and fit it into a 9-inch tart pan. Trim excess, prick the base with a fork, and freeze for 10 minutes.
07 - Line the crust with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes, remove weights, then bake 8 to 10 minutes until golden. Allow to cool slightly.
08 - Lower oven temperature to 300°F.
09 - In a bowl, whisk together heavy cream, granulated sugar, eggs, egg yolks, lemon zest, lemon juice, and a pinch of salt until smooth.
10 - Pour the lemon filling into the baked crust. Bake for 20 to 25 minutes until the edges are set and the center is just slightly jiggly.
11 - Allow tart to cool completely, then refrigerate for at least 1 hour before serving.
12 - Dust with powdered sugar and garnish with fresh berries or candied lemon slices, if desired.