Add all the ingredients except dumpling sheets and vegetable oil into a food processor. Grind it but don’t be too smooth so there will be some spanish mackerel texture in the dumplings.
Place about 1 tablespoon of filling on the dumpling wrapper.
You can wrap it as you like. Or you can wrap it like I do (see the step-by-step image).
Add a thin layer of oil above the steamer to avoid sticking to the ground.
Steam the dumplings for about 15-20 minutes. After the dumpling is cooked, place them on the plate.
Best to serve it with spicy peanut sauce. Enjoy!