Filetto di Vairano Patenora is a pork fillet from that Campanian town, taken as a natural cut in a thin veil and wrapped as filetto or filettone. What makes the piece worth a closer look is the covering fat: a regular deposit left entire so the fillet itself stays protected rather than trimmed bare.
After that, the meat is salted and given spices, then natural aromas. It is left to dry, pricked, and filled into natural casing. The sequence is quiet craft: seasoning first, air and a needle next, then the gut that holds the shape.
Later it may rest in traditional terracotta or glass jars, under oil or under lard. That is the useful distinction to carry forward: not only how the fillet is formed, but how it is kept, sealed away from air in those vessels. Regione Campania records the product this way.