Friend home homemade pickled lemon, a bit of orange peel taste. It is said that this sour ingredient can make meat or bones, such as pork feet, boil better. I've heard hawthorn is good, but I haven't tried it
It was done before, so there is no map, you understand. You can put it all together, ginger, pig's feet, lemon, water. Add more water, as it will take an hour or two to cook, depending on how soft and rotten the pig's feet are. There is voltage in the home of the pot, may be enough for half an hour, I use the induction cooker. Fast t good soy sauce, feel not salty enough to add salt, but to put the last.
When buying pig feet, be sure to shave off all the hair, otherwise it will affect your appetite.