This is simpler than you think; you can buy any whole fish you like and treat it in this manner. The flavours of the fish are naturally enhanced by the seasoning, and the searing of the spring onions with peanut oil gives a great fragrance and adds a delicious complexity of flavour that supports the delicate fish. The scoring on the fish ensures that the thicker body cooks as quickly as the thinner tail section and also makes it much easier to see when the flesh is cooked.