What true Chicago deep dish I dined on when there a couple of decades back, was some of the best pizza I ever had. I don’t remember any vendors though.
My first Chicago pizza was fall of 1973 at Gino's East. Sausage, mushroom and mozzarella(for the sake of the article)cheese. It's a good thing I have never lived in that area or I would weigh something obscene by now. I was there last fall for 5 days and gained 10 pounds, 5 of which I'm still struggling with.