Peel the onions and cut into small cubes. Now heat 1 tablespoon of fat in a saucepan and fry the onion cubes until translucent.
Peel the potatoes and kohlrabi and cut into small cubes. Add these cubes to the glassy onions and fry them briefly. Now pour in the vegetable stock and let the soup simmer for about 20 minutes.
Remove the vegetables from the broth and puree. Then return to the broth and dissolve the herb cheese in it.
Now press the sausages out of the skin and add them as small dumplings to the soup. Let the dumplings simmer in the soup, season with salt and pepper and serve with chopped parsley.