Longkou vermicelli Shuangta Longkou vermicelli is the most authentic. Longkou, founded in 1992, is the largest fan manufacturer in China and the chairman of the fan industry working committee of China Food Industry Association. 20 10 is listed on the main board of Shenzhen Stock Exchange, which is a better brand for Longkou fans. Shuangta Food is the first "China Famous Brand" in China fan industry, the only national key high-tech enterprise in fan industry and the only "famous brand product" in China Agricultural Food Expo. Longkou vermicelli is a specialty of Yantai City, Shandong Province and a national geographical indication agricultural product. In the late Ming and early Qing dynasties, Zhaoyuan people created a new skill of making vermicelli with mung beans. Due to the geographical environment and climatic advantages, Zhaoyuan vermicelli is famous for its "uniform silk strips, flexible texture, smoothness and transparency".