Ingredients
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1 1/2 lb. ground beef
Kosher salt
Freshly ground black pepper
8 Tbsp. butter, divided, plus more as needed
1 large onion, thinly sliced
8 slices rye bread
8 slices Swiss cheese
Directions
Step 1
Form beef into 4 slightly oblong patties and season each one with salt and pepper.
Step 2
In a large skillet over medium heat, melt 4 tablespoons butter. Add onion and cook until deeply golden, 20 minutes, stirring occasionally. Transfer onions to a plate.
Step 3
To same skillet, melt another 2 tablespoons butter over medium heat. Add patties and cook until desired doneness is reached, about 3 minutes per side for medium. Transfer patties to plate and tent with foil to keep warm. Drain fat.
Step 4
Return skillet to medium heat and melt remaining 2 tablespoons butter. Working in batches, toast slices of bread until golden, 2 minutes per side. Add more butter, as necessary.
Step 5
To assemble sandwiches, place one slice of Swiss cheese on a piece of bread, then a patty, caramelized onions, another slice of cheese, and top with a second piece of bread. Repeat with remaining sandwiches
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