Empanada Dough
2 1/4 cups (340g) unbleached all-purpose flour
1 1/2 teaspoons salt
1 stick (1/2 cup) cold unsalted butter, cut into 1/2-inch cubes
1 large egg
1/3 cup ice water
1 tablespoon distilled white vinegar
Put flour, salt, and butter into food processor. Pulse about 10 times until mixture resembles coarse meal with some (roughly pea-size) butter lumps. Beat together egg, water, and vinegar in a small bowl with a fork. Add to flour mixture, stirring with fork until just incorporated. (Mixture will look shaggy.)
Turn out mixture onto a lightly floured surface and gather together, then knead gently with heel of your hand once or twice, just enough to bring dough together. Form dough into a flat rectangle and chill, wrapped in plastic wrap, at least 1 hour.
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