Leave it for a day. After eating the dumplings on the 30th night, leaving one dumpling at the end or the pot is not empty mainly means that there will be more than enough to eat every year, so just save it until the first day of the new year. Dumplings originated from ancient coins. The original name of dumplings is "Jiao Er", which was first invented by Zhang Zhongjing, a medical saint in Nanyang, my country. It has a history of more than 1,800 years.