Jowl is where the pig keeps its secrets. Guanciale — the cured cheek fat that forms the backbone of true Carbonara and Amatriciana — is fundamentally different from pancetta, and Mangalitsa guanciale is different still. The fat is clean, ivory-white, and extraordinarily high in oleic acid, which means it melts at a lower temperature, coats a pasta without heaviness, and finishes with a sweetness that lingers. Cured simply with sea salt, black pepper, and time, this is the product that makes Italian nonnas nod in approval and chefs rethink everything they thought they knew about rendered fat.