1. Wash the pork bones and blanch them for about three minutes
2. Add auxiliary materials, appropriate amount of water, and pressure cook the pork bones to cook
3. Tear off the pressed pork bones, pour the meat, bones, and soup into a casserole, boil while stirring. Lasts about two hours. The soup is done for nothing.
Using a pressure cooker can save a lot of time. The boiled bone broth can be packed and frozen, and can be taken out when needed.