Cut butter (or shortening, I use butter flavored) into flour and salt.
In a Cup put egg and vinegar and fill to the top with water, work into the flour mixture. Makes 3 double crusts
Split into 6 even balls, roll out on floured surface each ball, place in pie plate, crimp edges, prick with fork on bottom and sides before baking into your favorite pie.
Remaining dough may be rolled in plastic wrap tightly, put into freezer bags and frozen up to 6 months.