Otoro tuna is rich in fat and absolutely delicious -- but why is it more expensive than so many other cuts of tuna used in sushi? Here's what to know.

In Japan, we call it okudo-san ... Chutoro, we call it like a medium-fatty tuna. So we're gonna cut today like, this much is enough. Today, gonna use that otoro, chutoro, and also part of akami ...