Miso Marinated Black Cod Recipe adapted from thekitchn.com
2 tablspoons sake
2 tablespoons mirin
2 tablespoons white miso paste
1.5 tablespoons sugar
2 black cod fillets, about 1/2 pound (230 g) each
Bring the sake and the mirin to a boil in a medium saucepan over high heat. Turn the heat down to low and stir in the miso until dissolved. Turn the heat up to high again and add the sugar. Remove from heat once the sugar is fully dissolved. Cool to room temperature.
Slather the fish with the miso marinade and place in dish or bowl and cover tightly with plastic wrap. Leave to steep in refrigerator for 2 to 3 days.
To cook, preheat the oven to 400°F. Lightly wipe off any excess miso clinging to the fillets but don’t rinse it off. Bake the fish for 10 to 15 minutes. To finish, turn the broiler on and watch carefully as the fish caramelizes and turns slightly golden. Remove and enjoy hot.