Category: not set
Cuisine: not set
8 tablespoons unsalted butter softened and divided
2 medium Vidalia or other sweet onions thinly sliced
2 pounds ground beef
2 teaspoons Worcestershire sauce
1 teaspoon kosher salt
1/2 teaspoon ground black pepper
1/2 cup mayonnaise
3 tablespoons Dijon mustard
2 teaspoons smoked paprika
12 slices sourdough sandwich bread
12 slices Cheddar cheese
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