Patsy's plain slice ($1.75) is a plain slice. Though charring from the vintage coal oven adds a faint ineffable flavor, on mine the tomato sauce and cheese have been livened up with a few shakes of countertop condiments. (Only whole pies, and not slices, are entitled to toppings at Patsy's.) Despite a few small air pockets in the lip, my slice was thin and pliable in the extreme: Not only did I fold it over double, for the last bite I doubled it over once again.
2287 First Ave. (117th-118th Sts.), Manhattan
(Oldest of multiple Patsy's locations; others are under separate ownership)