INGREDIENTS
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1 pound boneless beef sirloin or round steak
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1 tablespoon Kikkoman Stir-Fry Sauce
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2 tablespoons vegetable oil, divided
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2 medium bell peppers, cut into 1-inch squares
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2 medium onions, cut into 1-inch
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1/4 cup Kikkoman Stir-Fry Sauce