01 - Set oven temperature to 350°F (175°C).
02 - Combine all-purpose flour, powdered sugar, and salt in a food processor. Add cold, cubed butter and pulse until mixture resembles coarse crumbs.
03 - Add egg yolk and 2 tablespoons of cold water; pulse just until dough forms. Add an additional tablespoon of water if dough appears dry.
04 - Transfer dough to a lightly floured surface. Shape into a disk, wrap in plastic, and refrigerate for 30 minutes.
05 - Roll chilled dough to 1/8-inch thickness. Gently fit it into a 9-inch tart pan. Trim excess and dock the base with a fork. Freeze the crust 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 an additional 8 to 10 minutes until golden. Cool crust slightly.
07 - Lower oven temperature to 300°F (150°C).
08 - In a mixing bowl, whisk heavy cream, granulated sugar, eggs, egg yolks, lemon zest, lemon juice, and a pinch of salt until smooth and well combined.
09 - Pour prepared lemon mixture into the pre-baked crust. Bake 20 to 25 minutes, or until edges are set and the center is just slightly jiggly.
10 - Allow tart to cool completely on a wire rack. Transfer to the refrigerator and chill for at least 1 hour before serving.
11 - Dust tart with powdered sugar and top with fresh berries or candied lemon slices as desired.