01 -
In a mixing bowl, whisk together the miso paste, mirin, rice vinegar, sugar, soy sauce, and sake (or water, if substituting) until smooth.
02 -
Place the black cod fillets in a resealable bag or shallow dish. Pour the marinade over the fillets, ensuring they are evenly coated. Cover and refrigerate for at least 6 hours or overnight for best results.
03 -
Preheat your oven to 200°C (400°F). Line a baking sheet with parchment paper or foil.
04 -
Remove the fillets from the marinade and gently wipe off any excess. Place them skin-side down on the prepared baking sheet. Bake for 10-12 minutes, or until the fish flakes easily with a fork and is cooked through.
05 -
Serve the black cod hot, garnished with chopped green onions and lemon wedges, if desired.