In Japanese, "saku" means "block". These yellowfin tuna blocks come boneless, skinless, bloodline-removed, and vaccum packed. They are caught from long-line vessels using seine nets and sustainable fishing practices. Afterwards, thye are processed in Spain using only the most natural methods and treated with natural preservatives and antioxidants to retain and promote their red color without using CO2. You can use this tuna similarly to how you would use maguro in sushi, sashimi, and rolls, or sear it and add it as ahi tuna to salads and other delicious dishes.