01 - Set the oven to 350°F.
02 - In a food processor, combine all-purpose flour, powdered sugar, and salt. Add cold, cubed unsalted butter and pulse until the mixture is crumbly.
03 - Add egg yolk and 2 tablespoons of cold water to the processor. Pulse until the dough just starts to come together, adding extra water if needed.
04 - Turn the dough onto a lightly floured surface, form into a disk, wrap in plastic, and chill for 30 minutes.
05 - Roll the chilled dough to 1/8-inch thickness. Press into a 9-inch tart pan, trim excess, prick base with a fork, and freeze for 10 minutes.
06 - Line crust with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes, remove weights and parchment, then bake an additional 8 to 10 minutes until golden. Allow to cool slightly.
07 - Lower oven temperature to 300°F.
08 - In a mixing bowl, whisk together heavy cream, granulated sugar, eggs, egg yolks, lemon zest, lemon juice, and a pinch of salt until smooth and well combined.
09 - Pour the lemon filling into the baked crust. Bake for 20 to 25 minutes, until the edges are set and the center is slightly jiggly.
10 - Cool the tart completely on a wire rack. Refrigerate for at least 1 hour before serving.
11 - Dust with powdered sugar and garnish with fresh berries or candied lemon slices as desired.