What exactly is otoro tuna?

Otoro tuna is the richest cut of bluefin tuna, sourced from the belly of the fish, typically near the head. It should not be mistaken for chutoro, another belly cut that comes from the rear section of the fish.
Tuna has been highly regarded in Japanese cuisine since the Edo period. Interestingly, toro tuna was once discarded rather than appreciated. The exact moment when these fattier cuts began to be valued is unclear, but eventually, people recognized that they offered a deeper, umami flavor absent in leaner cuts.
This realization, along with the growing popularity of sushi worldwide, has driven up the price of otoro tuna significantly. Unfortunately, this surge in demand has contributed to overfishing of bluefin tuna, making various cuts, including otoro, increasingly scarce and expensive. Consequently, many have started to seek alternatives like salmon belly or yellowtail.
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