English muffins are the perfect vehicle for this twist on a patty melt because they toast as you’re melting the super gooey cheese, plus the nooks and crannies of the buns soak up all the juices of the special sauce, patty and caramelized onions!
Put 2 tablespoons butter, the onions and 1 teaspoon salt in a medium skillet over medium heat. Cook, stirring occasionally, until the onions begin to soften and release liquid, 10 minutes. If the skillet becomes a little brown, add 1 to 3 tablespoons of water, 1 tablespoon at a time, and scrape the bottom with a wooden spoon to release the browned bits and prevent burning. Add 1 teaspoon sugar and cook, stirring occasionally, until the onions are golden brown and soften, 10 minutes.
Form the ground beef into four 6-ounce patties (about 1/2 inch thick). Season the patties on both sides with several cracks of pepper and 1 tablespoon salt total.
Heat the oil in a 12-inch cast-iron skillet or large skillet over medium high heat until shimmering. Add the patties and cook to your desired degree of doneness, about 4 minutes per side for medium rare or 5 minutes per side for medium.
Meanwhile, make the special sauce. Stir together the mayonnaise, ketchup, relish, horseradish, Worcestershire sauce, remaining 1 teaspoon sugar and 1/4 teaspoon salt in a small bowl. Set aside.
Generously spread the remaining 1 tablespoon butter on the outsides of the English muffins. Put the tops, buttered-side down, in a large nonstick skillet over medium-low heat.
On each top, add 2 teaspoons of the special sauce, 1 cheese slice, 1 tablespoon caramelized onions and 1 patty. Top each patty with 1 tablespoon caramelized onions, 1 cheese slice and 1 English muffin bottom. Cover and cook until the bottom cheese slice melts, 2 to 3 minutes. Flip using two spatulas, cover and cook until bottom cheese slice melts and the English muffin is toasted, 2 to 3 minutes. Serve with the remaining sauce.
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