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melt 2 tbl butter in a skillet
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add onions and cook until caramelized, 20 minutes
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mix the ground beef and worcestershire sauce and form into 4 square patties
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when onions are done remove them to a plate and cook the patties until done, 3-4 minutes per side
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assemble patty melts
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bread, 1 slice swiss, the burger, the onions the other slice of swiss and then the top slice of bread
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melt 2 tbl of butter in the skillet and grill the sandwiches until toasted
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add last 2 tbl of butter, turn the patty melts and cook until toasted on other side and the cheese melts