Every year Bonito del Norte tuna migrate north as far as the Bay of Biscay in northern Spain. During the summer they fatten up for their return journey south. Just when the tuna are in top shape, fishermen harvest them with fishing rods; this method is safe for dolphins. Within 24 hours they are cooked in seawater and packed by hand in olive oil. The result is the most tender, silky canned tuna in the world. Try it on its own on crostini with a drizzle of the oil from the jar, you won't want to share. The can is 112 grams.