The Frosty Mug restaurant was in Monticello Indiana. I worked there when it was called The Tree House. The Kretchmar's guarded most of the recipe and would not let many know. Ruth and Bill made me swear not to tell anyone with was in their recipes. After they sold the restaurant Ruth published some of the guarded recipe in a local cookbook.
1 pound ground chuck
Salt to taste
Step 1: Cook ground beef with a little water,( don't fry ) and salt to taste. Mash up large pieces, but not too fine. Stir frequently at low heat until it is done. Pour off excess fat immediately. Steam buns, Using a strainer spoon, put ground beef on the bottom portions of the bun. Spread Cheese Whiz on the upper portion and put together.