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 the mixture is crumbly.
03 - Add egg yolk and 2 tablespoons cold water, pulsing just until the dough begins to come together. Use an additional tablespoon of water if needed.
04 - Turn dough onto a lightly floured surface, shape into a disk, wrap in plastic, and chill for 30 minutes.
05 - Roll dough to 1/8-inch thickness. Press into a 9-inch tart pan, trim excess, prick the base with a fork, and freeze for 10 minutes.
06 - Line the crust with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes, remove weights, then bake for an additional 8 to 10 minutes until golden brown. Let cool slightly.
07 - Reduce oven temperature to 300°F.
08 - In a mixing bowl, whisk together heavy cream, granulated sugar, eggs, egg yolks, finely grated lemon zest, fresh lemon juice, and a pinch of salt until completely smooth.
09 - Pour lemon filling into the pre-baked tart crust. Bake for 20 to 25 minutes, until the edges are set and the center remains just slightly jiggly.
10 - Cool the tart completely at room temperature, then refrigerate for at least 1 hour before serving.
11 - Dust the surface with powdered sugar and garnish with fresh berries or candied lemon slices, as desired.