Miso marinated and grilled fish.
It is sawara. You don't know ? Well, "Scomberomorus niphonius". OK in English : "Japanese Spanish mackerel". It even has a French name you never heard before and will never hear again : "thazard oriental".
Let's say sawara, or sawara mackerel.
The seikyo miso, AKA Kyoto miso is smooth white miso. It is made mostly of rice.