01 - Preheat oven to 350°F.
02 - In a food processor, briefly pulse together the flour, powdered sugar, and salt until fully blended.
03 - Add cold, cubed butter to the processor and pulse until the mixture becomes crumbly with visible pea-sized pieces.
04 - Add egg yolk and 2 tablespoons cold water, pulsing until dough just begins to come together, adding an additional tablespoon of water if needed.
05 - Transfer the dough to a lightly floured surface, shape into a disk, wrap tightly, and refrigerate for 30 minutes.
06 - On a floured surface, roll the chilled dough to 1/8-inch thickness. Line a 9-inch tart pan with the dough, trimming excess and pricking the base with a fork.
07 - Place the prepared crust in the freezer for 10 minutes to firm up before baking.
08 - Line the crust with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes, remove the weights, and bake an additional 8 to 10 minutes until the crust is golden. Allow to cool slightly.
09 - Lower oven temperature to 300°F.
10 - In a mixing bowl, whisk together the heavy cream, granulated sugar, eggs, egg yolks, lemon zest, lemon juice, and a pinch of salt until the mixture is completely smooth.
11 - Pour the lemon filling into the cooled crust. Bake for 20 to 25 minutes, or until the edges are set but the center is just slightly jiggly.
12 - Allow the tart to cool fully at room temperature, then refrigerate for a minimum of 1 hour before serving.
13 - Dust with powdered sugar and garnish with berries or candied lemon slices as preferred.