INGREDIENTS
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Four 5-ounce burger patties using 80/20 beef blend
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Salt and freshly ground black pepper
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8 slices Swiss cheese
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4 slices Cheddar
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8 slices seedless rye bread
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1 cup caramelized onions (such as Caramelized Onions or your favorite recipe)
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8 ounces (2 sticks) unsalted butter