Sal and Carmine’s plain slice ($2.50) is a local legend. "The light sauce is at one with olive oil, with a slightly tangy flavor that blends seamlessly with a generous layer of whole fat mozzarella." Read more.
If you want any chance at doing something else with your afternoon or evening, get there about a half hour before it opens. Order a whole pie; it's not worth the trip to get it by the slice. Read more.