"When making burgers, handle the meat as little as possible; a few pats with wet hands is all that's necessary to shape the patties...."
INGREDIENTS
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For the Burgers:
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1 1/2 pounds ground sirloin or chuck
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Salt and freshly ground pepper
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8 thin slices pancetta
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Four 1/4-inch-thick slices gorgonzola cheese (4 ounces)
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For the Buns:
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4 hamburger buns or kaiser rolls, split
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2 tablespoons unsalted butter, melted
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romaine lettuce leaves, tomato slices and paper-thin sweet onion slices