Conversation so far:
what ingredients are in a philly cheesesteak
Philly Cheesesteak is a sandwich made with super thinly sliced ribeye steak, caramelized onion, and provolone cheese.
did the philly cheesesteak come from philadelphia
A popular regional fast food, the cheesesteak has its roots in the U.S. city of Philadelphia, Pennsylvania.

Question: who invented the sandwich
Self-contained rewrite: who invented the cheesesteak