Makes enough for one 10-inch quiche, like our Maple-Bacon Quiche.
Pulse flour, salt, and sugar in a food processor to combine. Add butter, and pulse until mixture resembles coarse meal, about 10 seconds. With machine running, add ice water in a slow, steady stream until dough just holds together (no longer than 30 seconds).
Shape dough into a disk, and wrap in plastic. Refrigerate for at least 1 hour (or up to 2 days). Dough can be frozen for up to 1 month; thaw overnight in the refrigerator before using.