I use 90% fat free hamburger. I guess it is really ground beef. Oatmeal instead of bread crumbs, chopped onion, green pepper, V-8 juice - instead of tomato juice. Sometimes Worcestershire Sauce. Sometimes I use a pack of Onion Soup Mix. Egg hold it all together. Some like Ketchup on top, I don't like it and never use it on half of it.
I agree, it meant for sandwiches. We have it often in the winter.