In a sauce pan over medium-high heat, add the sake and rice vinegar.
3 tablespoons sake, 3 tablespoons rice vinegar
Bring the mixture to a boil and let it reduce by ⅓.
Reduce the heat to medium and add the sugar and miso paste.
⅓ cup miso white paste, ⅓ cup sugar
Simmer for 3-5 minutes and remove from the heat.
Allow the mixture to fully cool down.
Use a baking dish large enough to hold the fish and the marinade and add the cod and cover with miso marinade. Cover with plastic wrap and refrigerate for 24 hours.
1 lb Cod
Line a baking sheet with aluminum foil and place the fish on it.
Broil the fish on high for 10-12 minutes until it turns deeply golden brown. If you want to check the internal temperature it should read at 135F.
Serve with rice and cucumber salad.