Pulse flour, salt, and sugar in a food processor until combined. Add butter and pulse until mixture resembles coarse crumbs with some pea-size pieces remaining. Drizzle with 1/3 cup ice water and pulse until mixture holds together when pinched. If dough is too crumbly, add more ice water, 1 tablespoon at a time; do not over-process.
Divide dough in half. Transfer to 2 pieces of plastic wrap; knead once or twice. Form into disks and wrap in plastic. Refrigerate at least 1 hour and up to overnight, or freeze up to 3 months; thaw overnight in refrigerator before using.