Smothered Beef Liver
Ingredients:
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3 tablespoons vegetable oil
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1 large onion, sliced
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1 pound beef liver
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½ cup all-purpose flour
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1 teaspoon salt, or to taste
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¼ teaspoon ground black pepper, or to taste
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1 (8 ounce) can tomato sauce
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¼ cup water
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½ teaspoon dried oregano