Occhi di bue

In a large bowl, combine the 00 flour, cold unsalted butter, granulated sugar, and fine sea salt. Work the mixture with your fingertips until it resembles coarse crumbs.

Add the egg yolks, lemon zest, and vanilla extract to the mixture. Quickly knead until a smooth dough forms. Avoid overworking the dough.

Shape the dough into a disc, wrap it tightly in plastic film, and refrigerate for at least 30 minutes.