👨🍳 Instructions:
Form the Patties
Divide the ground beef into 4 equal portions and gently shape into flat patties, slightly larger than your bread (they shrink while cooking). Season both sides with salt and pepper.
Cook the Patties
Heat 1 tablespoon of butter in a large skillet over medium-high heat. Cook patties 4–5 minutes per side until nicely browned and cooked through. Set aside.
Caramelize the Onions
In the same skillet, melt the remaining butter. Add sliced onions and cook on medium-low heat for 15–20 minutes, stirring occasionally, until soft and golden brown. Remove and set aside.
Assemble the Sandwiches
Wipe the skillet clean. Lay out 4 slices of bread. On each, add a slice of Swiss cheese, a cooked patty, a spoonful of caramelized onions, and a second slice of cheese. Spread a generous amount of secret sauce on the top slice of bread, then place it on the sandwich.
Grill to Perfection
Return sandwiches to the skillet over medium heat. Press them down slightly and cook 2–3 minutes per side until the bread is golden and the cheese is melted. Cook in batches if necessary.
Serve and Enjoy
Let the patty melts rest briefly, then slice in half and serve hot with fries, pickles, or a side salad.
💡 Helpful Tips:
Bread choice matters: Rye adds classic flavor, but sourdough or even brioche makes for a delicious twist.
Use a cast iron skillet: It gives the best crust and even cooking.
Make ahead: Caramelized onions and the secret sauce can be prepped a day in advance to save time.
