After the donkey meat changes color, take it out and drain the water. The next step is to simmer it slowly to let the flavors blend, which is also a long process. Add the cooking ingredients, put the drained donkey meat back into the pot and simmer it over low heat. The reason why the process is said to be long is that this cooking takes at least half a day to allow the flavors of the seasonings to fully penetrate the meat, making the soup thick and delicious.