Combine flour, salt, and sugar in food processor. Pulse until blended.

Add cold butter, a few cubes at a time with process running. Texture should be crumbly.

Stream in ice cold water a bit at a time just until dough forms a ball.

Turn dough out onto sheet of plastic wrap. Pat with a bit of flour if it's too sticky. Wrap in plastic and flatten to 1" disk.

Refrigerate for 30 minutes before rolling out to fit pie pan.

Fill and bake according to recipe. If using a top crust, brush lightly with milk and dust with sugar before baking.