01 - Preheat oven to 350°F.
02 - In a food processor, combine flour, powdered sugar, and salt. Add cold cubed butter and pulse until mixture resembles coarse crumbs.
03 - Incorporate egg yolk and 2 tablespoons cold water, pulsing just until the dough starts to clump together. Add additional water only if needed for the dough to come together.
04 - Transfer dough onto a lightly floured work surface, form into a disk, wrap in plastic, and refrigerate for 30 minutes.
05 - Roll dough to 1/8-inch thickness. Fit into a 9-inch tart pan, trim excess, prick base with a fork, and freeze for 10 minutes.
06 - Line crust with parchment and fill with pie weights or dried beans. Bake for 15 minutes. Remove weights and parchment, then bake for 8 to 10 minutes more, or until golden. Allow to cool slightly.
07 - Reduce oven temperature to 300°F.
08 - In a mixing bowl, whisk together heavy cream, granulated sugar, eggs, egg yolks, lemon zest, lemon juice, and pinch of salt until fully combined and smooth.
09 - Pour lemon filling into the prepared tart crust. Bake for 20 to 25 minutes, or until edges are set and center jiggles slightly when gently shaken.
10 - Remove tart from oven, allow to cool completely on a wire rack, then refrigerate for at least 1 hour before serving.
11 - Lightly dust with powdered sugar and garnish with fresh berries or candied lemon slices as desired.