Sauerkraut soup

1. Cut up 1 medium onion and put it in a dutch oven.
2. Take a large jar or bag (not can) of sauerkraut (about 2 lbs).
3. Add water to cover and maybe a little more (she says for a dutch oven, fill pot, but that seems a bit much to me). Add 1 pkg hot dogs, cut up, and 1 large can whole tomatoes, broken up a little bit. Bring to boil, then simmer for about or sweet "n" low) to taste.
4. Serve.