Ingredients
- 3 tablespoons unsalted butter, at room temperature
- 1 large sweet onion, thinly sliced (about 10 ounces)
- Kosher salt and freshly ground black pepper
- 2 teaspoons granulated sugar
- 1 1/2 pounds ground beef
- 1 tablespoon canola or vegetable oil
- 1/4 cup mayonnaise
- 2 tablespoons ketchup
- 1 tablespoon dill relish
- 2 teaspoons prepared horseradish
- 1 teaspoon Worcestershire sauce
- 8 slices American cheese
- 4 English muffins, split
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