Clean, wash and cut the leek into rings. Peel and chop the onions. Peel and wash potatoes and cut into small cubes.
Bring the prepared ingredients with 1 l water and chicken broth to the boil in a large pot. Cover and simmer for about 20 minutes. Add butter. Mash roughly with a potato masher.
Press the sausage meat as small balls directly from the skin into the soup. Simmer everything at low heat for 8-10 minutes.
In the meantime, wash the parsley, shake dry, chop finely and stir into the soup. Season soup with salt and pepper. Serve the soup. Put 1 blob of crème fraîche on each and put some nachos in.
Add the rest of the nachos.