Lee's Kitchen Tips:
Gruyère is a hard yellow whole cow's milk cheese named after the French area of Switzerland known as Gruyères.
Swiss Emmentaler another whole cow's milk cheese and is made in Emmental, Switzerland.
Appenzeller, is the top of the line, and is also a whole cow's milk fruity cheese, also made in Switzerland. A good substitute for Appenzeller, if you cannot find it, is Norwegian Jarlsberg cheese..
Fontina is an Alpine cheese originating in Italy.
Stir for another minute.