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In a bowl, combine the flour, baking powder and salt; cut in shortening until the mixture resembles coarse crumbs.
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Gradually add milk, tossing with a fork until a ball forms.
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Cover and refrigerate.
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Meanwhile, in a skillet, cook beef and onion over medium heat until meat is no longer pink; drain.
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Add the tomato, egg salt and pepper; mix well.
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Roll out pastry into an 18x9-inch rectangle; cut into 3 inch squares.
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Place a rounded tablespoonful of filling in center of each square.
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Fold in half, forming triangles; crimp edges to seal.
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Place on greased baking sheets.
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Bake at 400°F for 15 to 20 minutes or until golden brown.
