01 - Preheat oven to 350°F.
02 - Combine all-purpose flour, powdered sugar, and salt in a food processor. Add cold cubed butter and pulse until mixture forms coarse crumbs.
03 - Incorporate the egg yolk and 2 tablespoons cold water. Pulse just until dough begins to form. Add up to 1 more tablespoon water if necessary.
04 - Transfer dough onto a lightly floured surface. Press into a disk, then wrap and chill for 30 minutes.
05 - Roll dough to 1/8-inch thickness. Gently fit into a 9-inch tart pan, pressing into corners. Trim excess and prick base with a fork. Freeze for 10 minutes.
06 - Line the crust with parchment paper and fill with pie weights or dried beans. Bake 15 minutes. Remove weights and bake an additional 8–10 minutes until golden brown. Allow to cool slightly.
07 - Reduce oven temperature to 300°F.
08 - Whisk heavy cream, granulated sugar, eggs, egg yolks, finely grated lemon zest, fresh lemon juice, and a pinch of salt in a bowl until fully combined and smooth.
09 - Pour lemon filling into the baked crust. Bake 20 to 25 minutes, until edges are just set and center is slightly jiggly.
10 - Let tart cool completely, then refrigerate for at least 1 hour before serving.
11 - Dust surface with powdered sugar and garnish with fresh berries or candied lemon slices as desired.