01 - Preheat the oven to 350°F.
02 - Combine flour, powdered sugar, and salt in a food processor. Add cold, cubed butter and pulse until the mixture resembles coarse crumbs.
03 - Incorporate the egg yolk and 2 tablespoons of cold water. Pulse briefly until the dough just starts to come together, adding more water if needed.
04 - Transfer dough to a lightly floured surface, form into a disk, wrap tightly, and refrigerate for 30 minutes.
05 - Roll the dough to 1/8-inch thickness. Fit into a 9-inch tart pan, trim excess dough, 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 bake for another 8 to 10 minutes 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 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 center is just slightly jiggly.
10 - Let the tart cool completely, 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.