01 - Preheat oven to 350°F (175°C).
02 - In a food processor, blend all-purpose flour, powdered sugar, and salt. Add the cubed butter and pulse until the mixture resembles coarse crumbs.
03 - Add egg yolk and 2 tablespoons cold water. Pulse briefly until the dough begins to form, adding an extra tablespoon of water if needed.
04 - Transfer dough onto a lightly floured surface. Shape into a disk, wrap tightly, and refrigerate for 30 minutes.
05 - Roll dough to 1/8-inch thickness. Gently press into a 9-inch tart pan. Trim excess, prick base with a fork, and transfer to freezer for 10 minutes.
06 - Line crust with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes. Remove weights and parchment, then bake 8 to 10 minutes more until golden. Let cool briefly.
07 - Reduce oven temperature to 300°F (150°C).
08 - In a mixing bowl, whisk together heavy cream, granulated sugar, eggs, egg yolks, lemon zest, lemon juice, and a pinch of salt until well combined.
09 - Pour lemon filling into the warm tart shell. Bake 20 to 25 minutes until edges are set and center is just slightly jiggly.
10 - Allow tart to cool completely on a wire rack, then refrigerate at least 1 hour before slicing.
11 - Dust with powdered sugar and add fresh berries or candied lemon slices before serving.