Peel, wash and chop the potatoes and cook in boiling salted water for about 20 minutes. In the meantime peel onions, dice 1 finely. Clean, wash and cut the peppers into fine strips.
Heat 1 tablespoon of oil in a saucepan. Sauté diced onions in it. Add paprika and sauerkraut, deglaze with apple juice. Add juniper. Season with salt, pepper, paprika and sugar. Simmer for about 25 minutes at medium heat.
Cut the remaining onion into fine rings. In the meantime heat milk and fat in a small pot. Drain the potatoes, add the milk and fat mixture and mash roughly with a potato masher. Season with nutmeg.
Keep covered and warm. Heat 1 tablespoon of oil in a large frying pan and fry the sausages for 3-4 minutes, turning them until golden brown. 1-2 minutes before the end of the frying time, add onion rings and fry until golden brown while turning.
Arrange mashed potatoes with onion rings, sauerkraut and sausages on plates. Sprinkle with paprika and garnish with chives.