Ultimate Patty Melt with Secret Sauce

A gooey, savory patty melt layered with Swiss cheese, caramelized onions, and a rich, tangy secret sauce—grilled to golden perfection.

Ingredients

For the Sandwich:

1 lb ground beef

8 slices rye bread

8 slices Swiss cheese

1 large onion, thinly sliced

4 tbsp butter, plus more for spreading

Salt and pepper to taste

For the Secret Sauce:

½ cup mayonnaise

2 tbsp ketchup

1 tbsp relish

1 tsp Worcestershire sauce

½ tsp garlic powder

½ tsp onion powder

Salt and pepper to taste

Directions