Traditional Jiangsu cuisine. By viewing the detailed introduction of Pickled Xian, Pickled Xian is a traditional Jiangsu dish, in which louver knot is an ingredient. Louver knots are made from duck intestine membranes after being pickled and dried. They are in the shape of flat knots and are named after their shape like louvers. It has the characteristics of fresh taste, soft texture and elasticity. It is one of the most important ingredients in pickled fresh food.