In a large bowl mix the flour, shortening, and salt together with a pastry blender until the mixture is crumbly (do not over mix). In a separate small bowl, beat the egg, vinegar and the ice water. Make a well in the center of the flour mixture, and add the liquid in the center, slowly incorporate the dry ingredients with a fork. After the ingredients are mixed, use your hands to mix the dough, until the dough is smooth. Do not handle dough to much, or the dough will be tough. Wrap dough with plastic and let it chill while you are making the filling
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