Brown sausage in butter in a frying pan then place in a 1 1/2-2 quart dutch oven or casserole dish.
Arrange onion, sauerkraut, apples and potatoes around sausage (draining only 1 can of sauerkraut). Top with apple juice and salt and pepper to taste.
If using dutch oven, cover tightly and simmer over low heat, stirring once, for 30 to 40 minutes or until potatoes are tender. If using oven, bake at 350 for 45 mins to 1 hours until potatoes are tender.
Garnish with a sprinkle of fresh parsley if desired and serve.