Basel is my town! I love my town and your Mehlsuppa!
This came out perfect and tasty. It's very important to cook the soup enogh time to combine well the flavors and make the soup thicker.
I used all the ingredients as described. Gruyere cheese is the cheese of choice and this is one of my favorites cheeses.
Next time I would only make one change: prepare some more soup!
Thanks a lot for this recipe!