INGREDIENTS
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3 tablespoons butter
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4 (1 to 1½ pounds total) beef cubed steaks
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1 small onion, finely chopped
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1/2 teaspoon salt
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1/2 teaspoon black pepper
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1 (12-ounce) jar brown gravy
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1 tablespoon white vinegar
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1/4 cup water
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1/2 cup coarsely crushed gingersnap cookies
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1 tablespoon light brown sugar
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1/2 cup sour cream