Peel onions and cut them into rings. Peel and wash the potatoes. Clean, peel and slice carrots. Wash parsley, shake dry and pluck leaves from the stalks. Chop leaves finely, except for something to garnish.
Heat the oil in a pan and fry the sausages for about 10 minutes while turning. Take out, keep warm. Fry onions in the frying fat for about 5 minutes. Deglaze with stock and beer. Add caraway seeds and vinegar, simmer for about 5 minutes.
Meanwhile, cook the potatoes in boiling salted water for about 20 minutes. Cook carrots in boiling salted water for 3-4 minutes. Drain the cooking water. Add butter and chopped parsley to the carrots, season with salt and nutmeg.
Bind onion sauce with sauce thickener. Cut the sausages into slices. Drain potatoes. Arrange potato, carrots and sausage on plates. Pour onion sauce over the sausage and garnish with parsley.