01 - Heat oven to 350°F.
02 - In a food processor, combine flour, powdered sugar, and salt. Pulse to blend.
03 - Add cold, cubed butter to the dry mixture and pulse until a crumbly texture forms.
04 - Add egg yolk and 2 tablespoons cold water; pulse until dough begins to form. If needed, add an additional tablespoon water.
05 - Transfer dough to a lightly floured surface, shape into a disk, wrap, and refrigerate for 30 minutes.
06 - Roll chilled dough to 1/8-inch thickness. Carefully fit into a 9-inch tart pan, trim excess, prick base with a fork, and freeze for 10 minutes.
07 - Line crust with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes, remove weights, and bake an additional 8–10 minutes until golden. Allow to cool slightly.
08 - Lower oven to 300°F.
09 - In a mixing bowl, whisk heavy cream, granulated sugar, eggs, egg yolks, lemon zest, lemon juice, and a pinch of salt until smooth.
10 - Pour filling into the cooled crust. Bake 20–25 minutes until edges are set and the center is slightly jiggly.
11 - Cool tart completely on a wire rack, then refrigerate for at least 1 hour before serving.
12 - Dust tart with powdered sugar and garnish with fresh berries or candied lemon slices, if desired.