The chef studied delicious food for the emperor. Legend has it that there was an emperor in ancient times, and his health went from bad to worse because he worked hard for the country. In order to recuperate the emperor's body, the royal chefs developed a delicious food with various kinds of meat, herbs and miscellaneous grains as the main ingredients, which was slowly stewed. After the emperor ate it, his body gradually recovered and he was refreshed. Therefore, the health-preserving cauldron is regarded as a kind of delicious food with magical effect, which has been passed down to this day.