Method:
Prepare the Secret Sauce:
- In a small bowl, combine the mayonnaise, ketchup, Dijon mustard, sweet pickle relish, Worcestershire sauce, garlic powder, and onion powder.
- Mix well until all ingredients are fully combined.
- Season with salt and pepper to taste, then cover and refrigerate until ready to use.
Caramelize the Onions:
- In a large skillet, melt 2 tablespoons of butter over medium heat.
- Add the sliced onions and a pinch of salt.
- Cook, stirring occasionally, until the onions are golden brown and caramelized, about 20-25 minutes. If the onions start to dry out, add a splash of water to deglaze the pan.
- Remove the onions from the skillet and set aside.
Cook the Beef Patties:
- Divide the ground beef into four equal portions and shape them into thin patties, slightly larger than the slices of rye bread (they will shrink as they cook).
- Season each patty with salt and pepper.
- In the same skillet used for the onions, cook the patties over medium-high heat for about 3-4 minutes per side, or until they reach your desired level of doneness.
- Remove the patties from the skillet and set aside.
Assemble the Patty Melts:
- Spread a thin layer of the secret sauce on one side of each slice of rye bread.
- On four of the bread slices, place a slice of Swiss cheese.
- Add a beef patty on top of the cheese, followed by a generous portion of caramelized onions.
- Top with another slice of Swiss cheese and the remaining bread slices, sauce side down.
Grill the Sandwiches:
- Wipe out the skillet and melt the remaining butter over medium heat.
- Place the assembled sandwiches in the skillet, cooking in batches if necessary.
- Cook each sandwich for about 3-4 minutes per side, or until the bread is golden brown and the cheese is melted. Press down gently with a spatula to ensure even grilling.
Serve:
- Cut the patty melts in half and serve hot, with extra secret sauce on the side for dipping.
Tips for Perfect Patty Melts:
- Bread Choice: Rye bread is traditional and adds a distinctive flavor, but you can also use sourdough or whole wheat if preferred.
- Cheese Melting: For the best melt, let the cheese come to room temperature before assembling the sandwiches.
- Caramelized Onions: Patience is key when caramelizing onions. Cook them slowly to bring out their natural sweetness and achieve a deep golden color.
Variations:
- Cheese Variety: Try using different cheeses like cheddar, provolone, or pepper jack for a unique twist.
- Spicy Kick: Add a few dashes of hot sauce to the secret sauce or use spicy mustard for a bit of heat.
- Vegetarian Option: Substitute the beef patties with veggie patties or grilled portobello mushrooms for a delicious vegetarian version.
