1½ Pounds ground beef
2 Tsp. Worcestershire sauce
1 Tsp. kosher salt
½ Tsp. ground black pepper
12 Slices sourdough bread
½ C. Secret Sauce
3 Med. Vidalia onions, thinly sliced
6 Slices Cheddar cheese
8 Tbsp. unsalted butter
¼ C. Dijon mustard
¼ C. mayonnaise
1 Tbsp. barbecue sauce
½ Tsp. hot sauce
In a small bowl, stir together mustard, mayonnaise, barbecue sauce, and hot sauce. Store, covered, in refrigerator up to 3 days.
HOW TO MAKE:
1-In a large bowl, combine ground beef, Worcestershire, salt, and pepper. Shape ground beef into 6 oval patties.
2-In a medium cast-iron skillet, melt 2 tablespoons butter over medium heat.
3- Add onion. Cook, stirring occasionally, until onion is soft and golden brown, approximately 35 minutes.
4-In a large cast-iron skillet, cook patties over medium-high heat until browned and cooked through, approximately 2 minutes per side.
5-Remove skillet from heat. Remove patties from skillet; wipe out skillet.
6-Layer 1 bread slice with 1 tablespoon Secret Sauce, 2 to 3 tablespoons caramelized onions, 1 slice cheese, 1 patty, and another 1 tablespoon Secret Sauce.
7-Top with another bread slice. Repeat with remaining bread,
8-Secret Sauce, caramelized onions, cheese, and patties.
9-Heat skillet over medium-high heat. Melt 2 tablespoons butter in skillet.
10-Working in batches, cook sandwiches, flipping once, until golden brown and heated through, approximately 3 minutes per side. Add remaining butter to skillet as needed.
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