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In a medium bowl, stir together flour, sugar, salt and baking powder.
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Using a pastry blender or fork, cut in 3/4 cup shortening until pieces are the size of small peas.
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In a glass measure, combine one beaten egg, 1 teaspoons vinegar and enough water to make 1/3 cup liquid.
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Add liquid to flour mixture.
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If necessary, add more water, 1 tsp at a time, until dough clings together.
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Divide in half and form each 1/2 into a ball.
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Each ball makes 1 crust.