Ingredients
- 1 1/2 pounds ground sirloin or chuck
- Salt and freshly ground pepper
- 8 thin slices pancetta
- Four 1/4-inch-thick slices Gorgonzola cheese (4 ounces)
- 4 hamburger buns or kaiser rolls, split
- 2 tablespoons unsalted butter, melted
- Romaine lettuce leaves, tomato slices and paper-thin sweet onion slices
Description
Food & Wine
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