Bring a large pan of water to boil and set a steamer basket on top. Place a plate inside the steamer basket.
2. Step
Peel the ginger with a spoon, then slice. Julienne half and set aside.
3. Step
Cut the green onions into 2-3 inch (5-7 cm) pieces. Thinly slice half and set aside.
4. Step
On the plate in the steamer, place the sliced ginger and cut green onions. Place the whole fish on top and cover with the lid. Steam for 8-10 minutes, or until the fish is cooked through--check by poking a chopstick through the thickest part of the flesh. Remove the fish from the steamer and transfer to a serving platter.
5. Step
Make the sauce: In a small bowl, combine the sugar, soy sauce, and sesame oil. Mix well.
6. Step
Scatter the sliced green onions and julienned ginger over the fish, then pour the hot oil and sauce on top.
