01 - Preheat oven to 350°F.
02 - In a food processor, combine flour, powdered sugar, and salt. Add cubed butter and pulse until the mixture is crumbly.
03 - Add egg yolk and 2 tablespoons cold water. Pulse just until the dough begins to form. Add an additional tablespoon of water if needed.
04 - Turn dough out onto a lightly floured surface, shape into a disk, wrap, and refrigerate for 30 minutes.
05 - Roll dough to 1/8-inch thickness. Line a 9-inch tart pan with dough, trim excess, prick base with a fork, and freeze for 10 minutes.
06 - Line the crust with parchment paper, fill with pie weights or dried beans, and bake for 15 minutes. Remove weights and bake for another 8 to 10 minutes until golden. Cool slightly.
07 - Reduce oven temperature to 300°F.
08 - In a mixing bowl, gently whisk heavy cream, granulated sugar, eggs, egg yolks, finely grated lemon zest, lemon juice, and salt until smooth.
09 - Pour the filling into the pre-baked crust and bake for 20 to 25 minutes, until the edges are set but the center remains just slightly jiggly.
10 - Cool the tart completely at room temperature, then refrigerate for at least 1 hour prior to serving.
11 - Dust the top with powdered sugar and garnish with fresh berries or candied lemon slices as desired.