In a food processor (or by hand), combine the butter, flour, rosemary, and salt. Pulse (or mix) until the mixture is just blended, leaving small pea-sized bits of butter throughout.

Gradually add the ice water, a little at a time, pulsing the processor (or tossing with a fork) after each addition. Add just enough water for the dough to come together. It’s okay if the dough looks slightly lumpy.

Remove the dough, shape it into a ball, and wrap it in plastic wrap or wax paper. Chill for about 30 minutes.