01 - Set oven temperature to 350°F and allow to fully preheat.
02 - Combine all-purpose flour, powdered sugar, and salt in a food processor. Add cold, cubed unsalted butter and pulse until the texture becomes crumbly.
03 - Add the egg yolk and 2 tablespoons of cold water to the mixture. Pulse until the dough just begins to form. If needed, add an additional tablespoon of water.
04 - Turn the dough onto a lightly floured surface, shape into a disk, wrap in plastic wrap, and chill in the refrigerator for 30 minutes.
05 - Roll out the chilled dough to 1/8-inch thickness and carefully press into a 9-inch tart pan. Trim any excess dough, prick the base with a fork, and freeze the crust for 10 minutes.
06 - Line the crust with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes, remove the weights, then bake an additional 8–10 minutes until golden. Allow to cool slightly.
07 - Reduce oven temperature to 300°F.
08 - In a bowl, whisk together heavy cream, granulated sugar, eggs, egg yolks, lemon zest, lemon juice, and a pinch of salt until the mixture is silky and smooth.
09 - Pour filling into the pre-baked crust. Bake for 20–25 minutes, until the edges are set and the center is just slightly jiggly.
10 - Allow the tart to cool completely at room temperature, then refrigerate for at least 1 hour before serving.
11 - Dust the tart with powdered sugar and garnish with fresh berries or candied lemon slices as desired.