Philadelphia Mayor Ed Rendell, cooks outside Philadelphia can't produce an authentic Philly cheesesteak because, "first, they use good meat. You need the fattiest, stringiest meat to get a proper taste... The second mistake is, they use real cheese. Real cheese doesn't melt like Cheez Whiz... And third, when they fry their onions, they actually drain off the grease. You can't do that."[
Says it all .