The ancient emperors were the most enjoyable emperors in the world, but in order to prevent the bad guys from poisoning their food, their diet had to go through a series of poison tests before it could be delivered to them, so as to ensure that the food could be eaten without problems. Although there are so many procedures, every emperor has to collect the best chefs and ingredients from all over the country and send them to the palace to cook for the emperor.
In order to prevent the emperor from having a sharp taste, the cooks and eunuchs in the palace eat some unusual foods all year round, so many seasonal vegetables and fruits will not be given to the emperor, so as to avoid cutting off their heads when the emperor wants to eat them but can't find them in the future. So eating Yangzhou food is the same. In order not to let the Qianlong emperor miss it later, he directly cooked the food with sweet roots, thus losing the original taste of the food, so that the Qianlong emperor would not feel delicious and would not say that he would eat it in the future, and their lives would be saved.
Yangzhou cuisine can also be cooked by the chef in the palace, but it won't be like what he ate in Yangzhou, because the food has lost its original taste after layers of poison testing procedures. When Emperor Qianlong saw that the taste was wrong, he was either furious, or cut off the chef's head, or changed the chef, so the eunuch finally got into trouble. Eunuchs can find people who can cook Yangzhou food, but they can't find anyone who can keep it delicious after a few hours, so it is absolutely.