Ingredients:
1 lb ground beef
1/2 tsp salt
1/2 tsp black pepper
1 yellow onion, thinly sliced
4 slices American cheese
4 slices Swiss cheese
4 slices Texas toast
Butter (for grilling)
Instructions:
1. Caramelize the onions:
In a skillet over medium heat, cook the sliced onions with a little butter until soft and golden brown (about 15 minutes). Set aside.
2. Make the patties:
Mix ground beef with salt and pepper.
Form into 4 flat patties.
3. Cook the patties:
Cook patties in a hot skillet for about 3-4 minutes per side until browned and cooked through.
Place a slice of American cheese on each patty to melt.
4. Assemble the sandwich:
On 2 slices of Texas toast, layer: patty with melted American cheese, caramelized onions, and a slice of Swiss cheese. Top with remaining toast slices.
5. Grill the sandwich:
Butter the outside of each sandwich.
Grill on a skillet or griddle until the bread is golden and crispy and the cheese is melted, about 2-3 minutes per side.
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