Prepare fish and rub in a little salt
and pepper. Heat up oil in frying pan and fry fish until it becomes
crisp on the outside. Place the fish on a serving plate. Leaving 2
tbsp of oil in the frying pan, fry the onion, garlic and ginger till
fragrant. Add soy sauce water, salt, pepper, sugar and vinegar and
cook for 2 minutes. Pour the sauce over the fish and sprinkle with
spring onion. Decorate with tomato.