Clean the fish and cut it into slices of an appropriate size, about 4 slices. Crush the scallion and ginger. Put them in a bowl with salt and wine. Marinate the fish slices with this mixture for 30 minutes.
Arrange the fish on platter. Place in a boiling steamer and steam about 8 minutes over high heat until done. (If you put three bamboo chopsticks under the f