Finely chop the onion. Crush garlic cloves and grate with 1/2 teaspoon salt to make a paste. Sweat in the fat until translucent. Cut the potatoes into fine cubes and sweat them briefly. Deglaze with a good dash of white wine and fill up with the broth. Simmer over medium heat for 15-20 minutes.
Puree the soup and reheat. Add the carrots cut into cubes and the cleaned and cut leek, simmer for another 6 - 8 minutes. Stir processed cheese into the soup. Season to taste with salt, pepper, cayenne pepper, nutmeg, marjoram and the mixed herbs.