Step 1In a double boiler over simmering water, combine the miso,
Step 2sugar, sake and mirin and whisk until the sugar dissolves, about 4
Step 3minutes. Remove from the heat and cool. Refrigerate until the
Step 4marinade is cold, about 20 minutes. Place the marinade in a baking
Step 5dish and add the black cod pieces, turning to coat thoroughly with
Step 6the marinade.
Step 7Cover with plastic wrap and refrigerate for 24 to 48 hours.
Step 8Remove the cod from the marinade and scrape off most of the
Step 10Heat the broiler. Place the cod on a greased foil-lined baking
Step 11sheet. Place the baking sheet approximately 6 inches below the
Step 12broiler unit. Broil 7 to 10 minutes, depending upon the thickness of
Step 13the fish, until evenly brown. The fish should flake easily. If not,
Step 14broil a little longer. Sprinkle with a touch of rice vinegar and
Step 15serve immediately.