Place flour and salt in a food processor. Add butter and pulse until mixture resembles coarse meal with some blueberry-size clumps.

Place flour and salt in a food processor. Add butter and pulse until mixture resembles coarse meal with some blueberry-size clumps. 2. Beat together egg, ice water, and vinegar in a small bowl. Add to flour mixture and pulse just until incorporated, about 10 times more. Squeeze a small amount of dough to make sure it holds together. If the dough is too dry, add more ice water, 1 tablespoon at a time. Divide dough in half and wrap each half in plastic wrap, forming each into 1 disk. Refrigerate at least 30 minutes and up to 2 days.