Fresh shredded cabbage -(optional) Diced mushrooms (optional) Rinse sauerkraut and drain well. Saute sauerkraut along with the onions in butter, bacon or salt pork for approximately 20 minutes on low heat, in a covered pan, stirring from time to time. Add salt, pepper, sugar (mushrooms if desired). Cool. * It doesn't say what to do with the shredded cabbage.