1. Combine flour, salt, and butter in a food processor. Process until mixture resembles coarse meal, about 8 seconds. Add 1/4 cup ice water in a slow stream through feed tube. Pulse until mixture holds together. Add more ice water, 1 tablespoon at a time, if needed, until dough holds together when squeezed.

2. Divide dough into two equal balls. Flatten each ball into a desk, cover with plastic wrap, and chill at least 1 hour.