On the first of the two bottom buns, add ½ tablespoon of the Special Sauce, ½ teaspoon of the onion, ⅛ cup of shredded lettuce, cheese, and one hamburger patty.In a medium sized skillet, cook 1-3 minutes on each side, or until cooked through. Season the hamburger patties with salt and pepper, to taste.Cover and refrigerate for an hour, at least, before serving. Mix all of the ingredients in a small bowl.A spot on replica of the classic fast food burger.