Place the flour, sugar, and salt in the bowl of a food processor, and pulse to combine. Add the butter and process until the mixture resembles coarse crumbs. While the machine is running, slowly drizzle in the water, 1 tablespoon at a time, and continue to process by pulsing until the dough just comes together to form a ball (you may not need to use all of the water, or you may need a bit more).
Transfer the dough to a lightly floured surface and shape it into a flat disk. Wrap it in plastic wrap and refrigerate it for at least 1 hour or up to overnight. (The dough can be frozen for up to a month; thaw it in the refrigerator before using.)
Yield: One 9- or 10-inch pie shell