Separate the skin and bones from the fish meat and put the meat in a bowl.
Add onion, salt and egg and add flour, black pepper powder, Chinese salt, tomato sauce and coriander and mix with a fork.
After that, cut the edges of the double bread.
Cut each slice into four parts and spread the prepared mixture on each slice of double bread.
Heat oil in a frying pan.
(The mixture should not be too thick, otherwise it will not stick to the slice) Put the slice in it and fry until it turns golden brown and take it out and keep it on a plate.