2. Freeze cod at room temperature, then wash it with water and drain it for later use.
3. Shred onion, shredded ginger (for steaming cod) and sliced (for pickling cod) for later use.
4. Put the cod in the dish and marinate it with ginger, salt and cooking wine for about 5 winds, turning it up and down during the period to make the cod taste better.
5. Take the cod out and put it in another clean plate, add the onion, shredded ginger, salt, cooking wine and soy sauce, and steam it in the pot (boil water in advance) for 8 minutes.
6. Don't open it immediately after steaming. Turn off the fire and wait for about 3 minutes before turning it on.
7. After cooking, heat some hot oil in a hot pot, pour it on the steamed cod, and then pour some steamed fish soy sauce, and you're done.