Prepare the Miso Marinade:

• In a small bowl, whisk together miso paste, mirin, sake (if using), sugar, soy sauce, and sesame oil until smooth.

Marinate the Cod:

• Pat cod fillets dry and coat evenly with the miso mixture.

• Cover and refrigerate for 30 minutes to 2 hours for best flavor.

Cook the Cod:

• Preheat oven to 400°F (200°C).

• Line a baking sheet with foil and lightly oil it.

• Place cod fillets on the sheet, skin side down, and bake for 12–15 minutes, or until the fish is opaque and flakes easily.

Optional Broil for a Glaze:

• For a caramelized finish, broil for 1–2 minutes at the end, watching closely to avoid burning.

Serve:

• Garnish with chopped green onions and sesame seeds.

• Serve with steamed rice, roasted vegetables, or a light salad.

• Add a lemon wedge for a bright citrus touch, if desired.