大おおトロ

noun

fatty belly of tuna; high-quality tuna belly

Refers specifically to the very fatty, marbled cut from the belly of a tuna, prized in sushi and sashimi.

• この寿す司し屋やの大おおトロはとろけるように美味おいしい。

  The fatty tuna belly at this sushi restaurant is melt-in-your-mouth delicious.