INGREDIENTS
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1 1/2 pounds ground beef
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2 teaspoons Worcestershire sauce
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1 teaspoon kosher salt
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1/2 teaspoon ground black pepper
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12 slices sourdough bread
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1/2 cup Secret Sauce
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3 medium Vidalia onions, thinly sliced
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6 slices Cheddar cheese
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8 Tablespoons unsalted butter
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Secret Sauce
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1/4 cup Dijon mustard
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1/4 cup mayonnaise
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1 Tablespoon barbecue sauce
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1/2 teaspoon hot sauce