Rinse the fish steaks with salt and water, then drain well. Place the fish in a tray and marinate with 2 tablespoons soy sauce (30 ml), 2 tablespoons oyster sauce (30 ml), 1 teaspoon sesame oil (5 ml), 1 teaspoon white wine (5 ml), 1 tablespoon fish sauce (15 ml), 1 tablespoon sugar (12 grams), and black pepper. Mix well to coat the fish, then slice ginger into thin strips. Place the fish in a steamer and steam for 40 minutes. When done, top with green onions while the fish is still hot.