Ahi Tuna Saku is a premium yellowfin tuna block sold by the pound at Costco's service deli counter. "Saku" is a Japanese term meaning "block," referring to a skinless, boneless portion trimmed from the center of the tuna loin. The result is a clean, rectangular cut with a deep red color and firm, dense texture ideal for sashimi, sushi, poke bowls, and seared preparations.

The block is prized for its mild, clean flavor and buttery texture when served raw or lightly seared. To prepare, simply defrost under refrigeration overnight, then slice thinly for sashimi or sear briefly in a hot pan with sesame oil for a restaurant-quality dish. The lean protein content makes it a nutritious choice, with approximately 120 calories and 28g of protein per 4 oz raw serving.