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 blend resembles coarse crumbs.
03 - Add the egg yolk and 2 tablespoons cold water to the mixture, then pulse briefly until the dough starts to come together. Add additional water, if necessary, by teaspoonfuls.
04 - Transfer dough onto a lightly floured work surface, form into a disk, wrap tightly, and refrigerate for 30 minutes.
05 - Roll dough to 1/8-inch thickness and press into a 9-inch tart pan. Trim excess edges, dock the base with a fork, and place in the freezer for 10 minutes.
06 - Line crust with parchment paper, add pie weights or dried beans, and bake for 15 minutes. Remove weights and paper, then bake 8 to 10 minutes more, until golden. Set aside to cool slightly.
07 - Reduce oven temperature to 300°F.
08 - In a large bowl, whisk together heavy cream, granulated sugar, whole eggs, egg yolks, finely grated lemon zest, fresh lemon juice, and a pinch of salt until completely smooth.
09 - Pour the lemon filling into the pre-baked crust. Bake for 20 to 25 minutes, or until the edges are set and the center remains slightly jiggly.
10 - Allow tart to cool completely at room temperature, then refrigerate for at least 1 hour before slicing.
11 - Dust with powdered sugar and garnish with fresh berries or candied lemon slices, as desired.