INGREDIENTS
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1 1/2 pounds flank steak
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1 large onion
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2 green peppers
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2 tablespoons vegetable oil
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1/2 cup ketchup
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1/4 cup water
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3 tablespoons soy sauce
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1 tablespoon white flour
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1 beef boullion cube
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1/4 teaspoon pepper
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4 ounces fresh mushrooms, sliced