Step：

1. Thaw the Black Cod Steak and clean it well;
2. Take out a large bowl; put the white miso, sugar, egg yolk, sake wine and mirin into the bowl, and then mix them well; add the black cod steak and set aside for 8 hours (keep in 0-4℃ refrigerator);
3. Heat up the oven to 200℃ and grill the black cod steak for 15 minutes, take it out and ready to serve.