This miso-based marinade produces spectacular results with fatty or oily fish such as salmon, sea bass, yellow tail, black cod, blue fish, and pompano. It cures the flesh slightly and permeates it with a delicate flavor. Grilling caramelizes and glazes the surface, leaving the flesh succulent. Plan to marinate the fish at least 12 hours before cooking. If you don't have sake, use a total of 1/2 cup mirin.