1. Process flour, salt, and sugar in a food processor until combined. Add butter. Process until mixture resembles coarse meal, about 10 seconds. With machine running, add ice water in a slow, steady stream just until dough comes together. (Do not process more than 30 seconds.)

2. Turn dough out onto a piece of plastic wrap. Flatten dough, and shape into a rectangle. Wrap in plastic. Refrigerate at least 1 hour (or overnight).