01 - 
                Mix mayonnaise, ketchup, mustard, pickle juice, paprika, and garlic powder in a bowl until smooth.
              
              
              
                02 - 
                Heat olive oil in skillet over medium-low heat. Cook onions until deep golden brown, about 30 minutes. Add water if needed to prevent burning.
              
              
              
                03 - 
                Mix ground beef with salt, pepper, and worcestershire sauce. Form into four thin, oblong patties to match bread shape. Cook in skillet until browned on both sides.
              
              
              
                04 - 
                Butter bread slices. Layer each sandwich: buttered bread (down), swiss cheese, beef patty, onions, secret sauce, cheddar cheese, buttered bread (up). Cook 1-2 minutes per side until golden brown.