01 - Set oven to 350°F.
02 - In a food processor, combine flour, powdered sugar, and salt. Add cold cubed butter; pulse until the mixture resembles coarse crumbs.
03 - Add egg yolk and 2 tablespoons cold water to the processor. Pulse until dough begins forming. Add another tablespoon of water only if needed.
04 - Transfer dough to a lightly floured surface, shape into a disk, wrap tightly, and refrigerate for 30 minutes.
05 - Roll dough to 1/8-inch thickness and gently press into a 9-inch tart pan. Trim any excess and prick the base with a fork. Freeze crust for 10 minutes.
06 - Line chilled crust with parchment paper and fill with pie weights or dried beans. Bake 15 minutes, remove weights, and bake 8–10 more minutes until golden. Let cool slightly.
07 - Lower oven setting to 300°F.
08 - In a mixing bowl, whisk together heavy cream, granulated sugar, whole eggs, egg yolks, lemon zest, lemon juice, and a pinch of salt until the mixture is thoroughly combined.
09 - Pour lemon mixture into the baked tart crust. Bake 20 to 25 minutes, until filling is set at the edges and the center is just barely jiggly.
10 - Allow tart to cool completely, then refrigerate for at least 1 hour prior to serving.
11 - Dust surface with powdered sugar and garnish with fresh berries or candied lemon slices as desired before serving.