This is going to sound ridiculous, but I've never had a Philly cheesesteak sandwich. OK, that's sort of not true. Yesterday, a friend took me to lunch and I had a Chicken Philly at a closet-sized place called Philly Grill (corner of Olympic & La Cienega in the strip mall, next to the 7-11). IT WAS FANTASTIC... a piping hot, gooey mess of onions, mushrooms and peppers. Granted, it was made with provolone, not cheese whiz, but now I'm obsessed with finding more of these heavenly sandwichs. Where are they?