Sausage, Sauerkraut

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1 lbs polish sausage (or bratwurst)
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2 lbs sauerkraut (ingredients are ONLY cabbage, salt, and water)
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1 lbs potatoes, diced
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1 lbs mushrooms, sliced
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1 onion, diced
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1 1/2 sticks no salt butter
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2 Tbsp olive oil
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1/4 tsp ground black pepper
Boil the sausage until it reaches 165 degrees F in the middle (about 15-20 minutes), then brown in a frying pan on low heat (level 2 on a gas stove) with the olive oil, about 5 minutes on each side. Slice the sausage.
Rinse the sauerkraut twice with water so it's less salty.
Melt 1 stick of butter in a tall pot. Add the onions, mushrooms, and black pepper. Saute on low heat (level 2 on a gas stove) until the onions are almost transparent, about 10 minutes. Add the sauerkraut and potatoes to the pot along with the other 1/2 stick of butter, and cook until the sauerkraut starts to brown (about 30 minutes), stirring often.
Empty the pot into a dutch oven along with the sliced sausage. Bake (covered) in the oven at 325 degrees F for 2 hours.
Serves 2-4 people.