2. Pat the fillets dry with paper towels. Place some of miso marinade from Step #1 on the bottom of a deep dish and lay the fillets on top. Slather the fillets with the remaining miso marinade. Cover tightly with plastic wrap and keep in the fridge overnight.
3. Preheat oven to 200C degree. Remove the fillets from the marinade, wipe off any excess marinade with your fingers - do not rinse them off - and place them on a baking pan lined with parchment paper. The fish should be placed skin side up (if any).
4. Grill until the surface of the fillets turns nicely brown (it should take about 15 min) or until the fish is opaque and flakes easily with a fork.