Pulse flour, sugar, and 1 teaspoon salt in a food processor until combined. Add butter. Pulse until mixture resembles coarse meal, about 10 seconds. Drizzle 1/4 cup ice water evenly over mixture. Pulse until mixture just begins to hold together (dough should not be wet or sticky). If dough is too dry, add more water, 1 tablespoon at a time, and pulse. Shape dough into 2 disks, and wrap each in plastic wrap. refrigerate until firm, about 1 hour or up to overnight.