It is a modified version of  the Coriander or Cilantro Fish Soup. (莞茜滾魚片湯- 走皮蛋). As I could not find Coriander or Cilantro here. I use Parsley to replace it. 

Fry both side of the fillet.  Wash Parsley and chop it into small pcs (can bring out more scents). Put all the ingredients into boiling water. Lastly, add 大地魚粉/ other seafood brooth/or simply add salt.