"Simple Patty Melts are one of the greatest classic American diner foods known to mankind! These iconic sandwiches are absolutely delicious!..."
INGREDIENTS
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4 tablespoons butter (divided)
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2 medium onions (thinly sliced)
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1 pound ground beef
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salt and pepper (to taste)
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8 slices rye bread (or your favorite sandwich bread)
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4 tablespoons mayonnaise
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8 slices Swiss cheese