Jamon Iberico - Immediately after weaning, the piglets are fattened on barley and maize for several weeks. The pigs are then allowed to roam in pasture and oak groves to feed naturally on grass, herbs, acorns, and roots, until the slaughtering time approaches. At that point, the diet may be strictly limited to olives or acorns for the best quality jamón ibérico, or may be a mix of acorns and commercial feed for lesser qualities.
The hams from the slaughtered pigs are salted and left to begin drying for two weeks, after which they are rinsed and left to dry for another four to six weeks. The curing process then takes at least twelve months, although some producers cure their jamones ibéricos for up to 48 months.