Huai yam is an iconic ingredient in Huai'an, a delicious vegetable that is steamed, boiled, roasted, and stir fried. The rhizome of Huai yam is thick and short, the meat is white and tender, and the starch content is high. In autumn and winter, there is a folk tradition of stewing old duck with Huai yam. This Huai yam and duck soup evolved from the foundation of stewing old duck with Huai yam.