Some call it scallion, some call it spring onion, some call it green onion. It is all the same. The Chinese call it "chung"(葱) and when it is paired with ginger (姜), it makes a pretty decent dish. The combination of both ginger and scallion is aptly use to add flavour and smell to the otherwise mildly flavoured fish. The ginger is also use to stave off the fishy smell of the protein.
This is a common Chinese household dish. Well, maybe not so common now since the price of fish has gone up many folds compared the olden days. If you are looking at more quality sea fish such as a fresh grouper, the price could be as high as RM35 per kilo. However, this method of cooking is actually more flexible as the fish is first fried and later combined with other flavours (unlike steamed fish dishes whereby only certain types of fish is suitable). Therefore, you could even use dory if you fancy.