1.Combine fish, sesame oil and grated ginger in a bowl. Season to taste and set aside to marinate for 5 minutes.
2.Heat rice bran oil in a wok on high. Stir-fry fish and ginger strips gently, being careful not to break up fish, for 1-2 minutes, until fish is opaque. Add sherry, cover and bring to boil. Cook for 1 minute.
3.Whisk together cornflour, soy sauce and water. Add to wok and simmer for 1 minute, until sauce thickens. Stir through green onion. Top with coriander and serve with steamed rice.
As this dish is very quick to cook and fish is best eaten hot, have the table set and everyone close by before you start to cook so you can eat it immediately. The key to this dish is the freshness of the fish, ginger, green onion and coriander.