There used to be a guy that ran a great little eatery near my house called "Phillysophical Deli," really great Philly Cheese Sandwiches with the addition of onions and mushrooms. Really greasy food food though and not good for the ol' circulatory system, but damn it tasted good. Not sure whether it would be authentic but it was good regardless. Too bad the guy went out of business, not much call for Philly Cheese in Hawaii I guess.