Ruudou Long Fish, also known as "Ruudou Eel", is a traditional famous dish of the Han people in Jiangsu. It is one of the most famous dishes in Huaiyang cuisine. Huai'an people treat Chinese and foreign guests favorably with this dish. The dishes that are "fresh, tender, delicious and unique" are given to guests to try and praise them endlessly. Efficacy of the recipe: nourishing deficiency and nourishing the body, nourishing Qi and blood, nourishing malnutrition, and regulating postpartum recovery. According to the "Book of Mountains and Seas": "The water irrigated by lakes contains a lot of eels." The Jianghuai region is rich in eels, which are tender, delicious and nutritious. Huai'an famous chef Tian Shumin and his son can make 108 kinds of delicacies using eels as raw materials, which is the famous The "whole eel feast". The soft pocket eel is the highlight of the eel banquet. The word "double" refers to the way the eels were put into cloth bags and then finely processed.