Heat a skillet over medium high heat. Add oil, butter, and onion and saute 2 minutes. Add cabbages and turn in pan, sauteing it until it wilts, 3 to 5 minutes. Add vinegar to the pan and turn the cabbage in it. Sprinkle sugar over the cabbage and turn again. Season with mustard seed, caraway seed, crushed red pepper, salt and pepper and reduce heat a bit. Let cabbage continue to cook 10 minutes or until ready to serve, stirring occasionally.