Categories: Burgers

Ingredients

• 1 1⁄2 lb. ground beef
• Kosher salt and freshly ground black pepper, to taste
• 5 tbsp. canola oil
• 2 yellow onions, halved and thinly sliced
• 12 slices rye bread
• 12 thin slices cheddar, swiss, or American cheese
• 8 tbsp. unsalted butter, softened

Directions

1. Season the beef with salt and pepper. Divide meat into six 1⁄4"-thick patties that are slightly wider and longer than the bread.

2. Heat 2 tbsp. oil in a 12" cast-iron skillet over medium-high heat. Add the onions, season with salt and pepper, and cook, stirring occasionally, until softened and browned, about 12 minutes. Transfer the onions to a bowl; wipe out skillet. Working in 3 batches, heat 1 tbsp. oil in skillet over high heat. Add 2 burger patties; cook, flipping once, until well browned, about 4 minutes total. Transfer patties to a plate.

3. Top each of 6 bread slices with some of the onions, a cheese slice, and a burger patty. Top each burger with a cheese slice and a piece of bread. Using a table knife, spread butter over the top and bottom of each sandwich.

4. Heat a 12" nonstick skillet over medium heat. Working in 3 batches, cook sandwiches, flipping once, until golden brown and hot, about 6 minutes.

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