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This is a recipe for making a homegrown clone of what I believe is the best hamburger in the world. The ingredients are fresh, and simple and the stacking order is crucial. Certainly one of the secrets to duplicating this and other fast food burgers is getting the beef patties super thin—about 1/4 inch-thick. If you like, you can press the ground beef into uniform shapes onto wax paper and freeze the patties ahead of time. Freezing makes the thin patties easier to handle and they will hold their shape better. As for the secret sauce, Kraft thousand island dressing will do.
Source: Top Secret Recipes by Todd Wilbur.