Pulse together flour, sugar, and salt in a food processor. Add butter; pulse until mixture resembles coarse crumbs with some small pea-size pieces remaining. Add 1/3 cup ice water; pulse until mixture holds together when pinched. If too dry, add more water, 1 tablespoon at a time.
Transfer dough to a piece of plastic wrap and knead once. Pat into a disk; wrap in plastic. Refrigerate at least 1 hour and up to 1 day, or freeze up to 3 months; thaw overnight in refrigerator before using.