I don't know if it's a regional thing or not, but around here sub shops offer something called a "steak bomb". It's basically a pepper steak with onions. When the meat is almost ready to go into the roll, it's topped with a layer of Genoa salami and a layer of cheese while on the griddle. Then it's picked up on a long spat and inverted into a roll. Residual heat melts the cheese and releases the flavors of the salami.
I has some salami hanging around and thought it would be a good idea to try it on a burger. It was.
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan