Tuna's lean part - Akami (red meat).  This is the lean part of tuna.  The least expensive of the 3 different parts of tuna, Akami, Chu-toro and O-toro.  That does not mean the tuna taste less delicious.  All 3 different parts have its own enjoyment.  


Also sold as Frozen Blocks $0.11/g  

マグロ赤身 Tuna Red Meat (280-300g)