Miso stewed mackerel is one of the Japanese comfort food, and many people site this as “the flavor of mom’s cooking.” It may look difficult, but it is pretty quick and easy to make. The point of stewing fish is to cook quickly with relatively high heat. The entire process takes less than 30 minutes.
You can experiment difference of flavors using different types of miso paste, and adjust the amount of sugar accordingly.
If you buy whole mackerels, or caught them, see the direction of how to fillet mackerels.