Firstly fry the fish together with ginger and chicken feet.Then add two cups of water and let it boil for five mins.Take a fish bag and put the fish and ginger inside.Pour the soup in dip.pot.Put back the fish net inside and add water until the half of pot.Add salt too.Keep boiling for around 30 mins.Then add bakchoy boil again until bakchoy are soft then put the tofu.Boil for another 20 mins.