1. Pulse flour, salt, and sugar in a food processor until combined. Add butter, and process until mixture resembles coarse meal, about 10 seconds. With the machine running, add water in a slow, steady stream until mixture just begins to hold together.

2. Shape dough into 2 disks. Wrap each in plastic, and refrigerate 1 hour to 2 days (or freeze for up to 1 month; thaw in refrigerator before using).