Salt-Cured Tuna and Pickled Onions

Tuna fishing in Spain is a major industry and, unsurprisingly, Japan is Spain’s biggest customer. Of the fish that remain in Spain, fresh cuts are gaining in popularity, and canned tuna is evergreen. But salt-cured tuna hardly gets a mention. Mojama is the ham of the sea, and if it is on a restaurant menu, it’s used in much the same way as good jamón.