01 - Preheat the oven to 350°F. Ensure the rack is positioned in the center.
02 - In a food processor, blend the all-purpose flour, powdered sugar, and salt until combined.
03 - Add the cold, cubed unsalted butter and pulse until the mixture resembles coarse crumbs.
04 - Add the large egg yolk and 2 tablespoons cold water; pulse briefly until the dough just begins to form. If needed, add an additional tablespoon of water.
05 - Transfer dough onto a lightly floured surface and shape into a disk. Wrap tightly in plastic and chill for 30 minutes.
06 - Roll out the 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 the crust with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes. Remove the weights, then continue baking for 8 to 10 minutes until lightly golden. Cool the crust slightly.
08 - Reduce the oven temperature to 300°F.
09 - In a bowl, whisk together heavy cream, granulated sugar, eggs, egg yolks, lemon zest, lemon juice, and a pinch of salt until smooth.
10 - Pour the lemon filling into the pre-baked crust. Bake for 20 to 25 minutes, or until the custard is set at the edges and slightly jiggly at the center.
11 - Allow tart to cool completely on a wire rack. Refrigerate for at least 1 hour before serving.
12 - Dust with powdered sugar and garnish with fresh berries or candied lemon slices as desired.