Clean and wash the leek and cut into fine rings. Melt the fat and fry the leek in it. Deglaze with broth, season with salt and pepper. Simmer covered for about 10 minutes. In the meantime cut meat loaf and pretzel rolls into pieces and skewer them.
Fry them all around in hot oil until golden brown. Stir cream, processed cheese and Gouda into the soup. Bring to the boil briefly and season to taste with salt, pepper and nutmeg. Garnish with parsley and coarse pepper and serve on a skewer