This has always been the favorite tuna of the greeks, due to the distinct taste and unparalleled quality that only the excellent processing of quality tuna can offer. The rio mare tuna processing system is very simple. The tuna is steamed and then worked by hand (just like the good old days) to ensure thorough cleaning and excellent quality. It is then preserved together with pure olive oil and a pinch of sea salt, without preservatives and artificial flavors.