A kind of shortbread made from fern in the city of Fern. Potentilla japonicus is also known as ginseng fruit. Ginseng fruit refers to the root of a wild perennial herb. The roots of this plant are called fern, also known as Yanshou fruit and Penglai fruit. Ginseng fruit is a good dessert ingredient. It contains 63% sugar, 15% protein, 1.1% fat, and is rich in vitamins and inorganic salts such as calcium, phosphorus and iron. Can be used to make sugar and wine. Generally use its roots to make porridge, sweet and healthy, delicious and delicious. It can also be used as an ingredient in Babao rice and pastries, while Tibetans mix it with rice and add ghee to become a gourmet.