"Classic patty melts are so simple to make and so yummy, you'll never have leftovers. Serve with chips or hand-cut fries, pickles and a cold root beer for a restaurant style meal at home...."
INGREDIENTS
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1 large onion, sliced thinly
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2 Tablespoons cooking oil
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1 1/12 pounds ground beef
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1 teaspoon Kosher salt or 1/2 teaspoon table salt
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1/2 teaspoon freshly ground pepper
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8 slices rye bread
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8 slices American or Swiss cheese
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butter for spreading