INGREDIENTS
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1 1/4 pounds coarsely ground beef chuck (70 percent lean)
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Coarse salt and freshly ground pepper
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4 slices American cheese
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4 teaspoons unsalted butter, softened
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4 potato sandwich rolls
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1/4 cup diced white onion
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1 dill pickle, thinly sliced
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1 cup shredded iceberg lettuce
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4 teaspoons yellow mustard