This recipe makes enough dough for two 8-by-11-inch Asparagus Tarts.
Pulse flour, sugar, and 1 teaspoon salt in a food processor until combined. Add butter, and 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.
Dough can be refrigerated overnight or frozen for up to 3 months. Thaw before using.