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Prepare the Miso Marinade: In a medium saucepan, combine the white miso paste, sake, mirin, and granulated sugar. Whisk thoroughly until the sugar dissolves and the mixture is smooth. Bring the mixture to a gentle simmer over medium heat, stirring constantly, for 3 to 5 minutes until it thickens slightly and becomes glossy. Do not boil. Remove from heat and let cool completely to room temperature.

Marinate the Cod: Pat the black cod fillets dry with paper towels. Place the cooled miso marinade in a shallow dish or a resealable plastic bag. Add the cod fillets, ensuring they are fully coated with the marinade. Cover the dish or seal the bag and refrigerate for at least 24 hours, and preferably up to 48 hours, turning once if marinating in a dish.

Prepare for Cooking: When ready to cook, remove the cod from the refrigerator. Gently scrape off any excess marinade from the fillets (do not rinse), leaving a thin, even layer on the fish. Let the fish come to room temperature for about 30 minutes.

Preheat Broiler: Position an oven rack about 6 to 8 inches from the broiler element. Preheat your broiler to high. Line a baking sheet with aluminum foil and lightly grease it with vegetable oil to prevent sticking.

Broil the Cod: Place the marinated cod fillets on the prepared baking sheet, skin-side up if applicable. Broil for 8 to 12 minutes, or until the fish is opaque and flaky, and the marinade has caramelized to a deep golden brown with some charred spots. Keep a close eye on it to prevent burning, as the sugar in the marinade can burn quickly.

Serve: Carefully transfer the cooked cod fillets to individual serving plates. Garnish with thinly sliced green onions and toasted sesame seeds, if desired. Serve immediately.


Prepare the Miso Marinade: In a medium saucepan, combine the white miso paste, sake, mirin, and granulated sugar. Whisk thoroughly until the sugar dissolves and the mixture is smooth. Bring the mixture to a gentle simmer over medium heat, stirring constantly, for 3 to 5 minutes until it thickens slightly and becomes glossy. Do not boil. Remove from heat and let cool completely to room temperature.

Marinate the Cod: Pat the black cod fillets dry with paper towels. Place the cooled miso marinade in a shallow dish or a resealable plastic bag. Add the cod fillets, ensuring they are fully coated with the marinade. Cover the dish or seal the bag and refrigerate for at least 24 hours, and preferably up to 48 hours, turning once if marinating in a dish.

Prepare for Cooking: When ready to cook, remove the cod from the refrigerator. Gently scrape off any excess marinade from the fillets (do not rinse), leaving a thin, even layer on the fish. Let the fish come to room temperature for about 30 minutes.

Preheat Broiler: Position an oven rack about 6 to 8 inches from the broiler element. Preheat your broiler to high. Line a baking sheet with aluminum foil and lightly grease it with vegetable oil to prevent sticking.

Broil the Cod: Place the marinated cod fillets on the prepared baking sheet, skin-side up if applicable. Broil for 8 to 12 minutes, or until the fish is opaque and flaky, and the marinade has caramelized to a deep golden brown with some charred spots. Keep a close eye on it to prevent burning, as the sugar in the marinade can burn quickly.

Serve: Carefully transfer the cooked cod fillets to individual serving plates. Garnish with thinly sliced green onions and toasted sesame seeds, if desired. Serve immediately.
