1. Lightly beat yolks and water in a small bowl until combined.

2. Pulse flour, sugar, and a pinch of salt in a food processor until combined. Add butter, and process until mixture resembles coarse meal, about 20 seconds. With the machine running, add yolk mixture in a slow, steady stream. Process until mixture just begins to hold together (no longer than 30 seconds).

3. Shape dough into 2 disks, and wrap each in plastic. Refrigerate until firm, 30 minutes to overnight.