Mashed potato served with Frankfurter Rippchen, sauerkraut and mustard Mashed potato can be served as being a side dish. during the British Isles, sausages served with mashed potatoes are referred to as bangers and mash. A plate of sausage and mashed potatoes, with cabbage and onion gravy, typically often called "bangers and mash" 1 French variat