Creating irresistible patty melts with secret sauce is a straightforward process. Follow these steps for a delicious result:

1. Prepare the Secret Sauce: In a bowl, combine mayonnaise, ketchup, mustard, dill pickle relish, Worcestershire sauce, salt, and pepper. Mix well and set aside.

2. Caramelize the Onions: In a skillet over medium heat, melt 1 tablespoon of butter. Add the sliced onions. Season with salt and cook until soft and golden, about 15-20 minutes, stirring frequently. Remove from heat and set aside.

3. Form the Patties: In a bowl, season the ground beef with salt and pepper. Divide it into four equal portions and shape them into patties slightly larger than your bread slices.

4. Cook the Patties: In the same skillet used for the onions, add a bit more butter. Over medium-high heat, cook the patties for about 4-5 minutes on each side for medium doneness. In the last minute of cooking, place a slice of cheese on each patty to let it melt. Remove from heat.

5. Toast the Bread: In another skillet, melt the remaining butter over medium heat. Place two slices of bread in the skillet to toast until golden on one side. Flip them over, and add the patties on top of the un-toasted side.

6. Layer Onions and Sauce: Add a generous amount of caramelized onions on top of each patty and then drizzle with the secret sauce.

7. Finish Toasting: Top with the remaining slices of bread, toasting until golden brown on both sides.

8. Serve Warm: Allow the melts to rest for a minute before slicing in half.

This method ensures that your patty melts are packed with flavor and texture, making them truly irresistible!