01 - Preheat oven to 350°F. Ensure oven rack is center positioned.
02 - In a food processor, combine all-purpose flour, powdered sugar, and salt. Pulse to blend.
03 - Add cold cubed butter to the food processor. Pulse until mixture resembles coarse crumbs.
04 - Add egg yolk and 2 tablespoons cold water. Pulse until dough begins to come together. Add up to 1 additional tablespoon water if needed.
05 - Turn dough onto a lightly floured surface, shape into a disk. Wrap and refrigerate for 30 minutes.
06 - Roll chilled dough to 1/8-inch thickness. Press into a 9-inch tart pan. Trim excess and prick base with a fork. Freeze for 10 minutes.
07 - Line chilled crust with parchment paper and fill with pie weights. Bake for 15 minutes. Remove weights and bake for an additional 8 to 10 minutes until golden. Allow to cool slightly.
08 - Reduce oven heat to 300°F in preparation for the filling.
09 - In a mixing bowl, whisk heavy cream, granulated sugar, whole eggs, egg yolks, finely grated lemon zest, fresh lemon juice, and a pinch of salt until smooth.
10 - Pour filling into pre-baked crust. Bake for 20 to 25 minutes until edges are set and center is slightly jiggly.
11 - Cool tart completely, then refrigerate at least 1 hour before serving. Dust with powdered sugar and garnish with fresh berries or candied lemon slices if desired.