The Panino con Provola leads on a Campanian stretched-curd cheese in its plain, unsmoked state, and the point of it is what provola is before anything is done to it. It is a pasta filata cheese, the curd heated and worked until it turns elastic, then formed into a smooth pear-shaped ball, closer in family to mozzarella than to an aged wheel but firmer, drier, and a touch more savoury. Fresh provola is mild, milky, and faintly tangy, with a tight springy body that holds a clean slice. The whole sandwich rests on choosing it young and letting that gentle, lactic character be the entire statement, nothing layered over it.
The craft is matching a moist, springy cheese to bread and timing. Provola carries real moisture, so it is sliced rather than torn, and the bread is chosen with enough structure to take it without going damp: a crisp-shelled roll or a firm country loaf rather than anything soft. It is assembled close to eating so the cut faces stay fresh and the bread stays dry under it. A thread of good oil and a little salt is the most that belongs here, and often nothing at all, because a young stretched-curd cheese at its peak is delicate and easily buried. Eaten at room temperature, the body reads soft and the milk comes forward; cold, it tightens and goes mute.
The single defining variation is the smoked one, the panino con provola affumicata, where the same cheese is hung in smoke and the milky base is overlaid with a wood note, the smoke standing as the one variable against this plain version. Beyond it sit the other Campanian stretched-curd cheeses, the aged sharp provolone del Monaco, the caciocavallo of the south, each a different point on the same pasta filata family. Those deserve their own articles rather than being crowded in here.