Meaning
中とろ (ちゅうとろ, Chūtoro) is Chutoro, a Japanese food (meats).
What is Chutoro?
Chūtoro (中とろ) is the name for medium fatty tuna when served in sushi restaurant. A bluefin tuna yields akami (赤身, red meat), chūtoro , and ōtoro (大とろ, pink fatty tuna). Chūtoro is usually found near the skin on the back and belly. It combines the lighter but deep, slightly bitter flavor of an akami with the sweet tenderness of an ōtoro . It is quite expensive and usually served only on special occasions.