Boxed beef noodles. (Photo/People's Daily Online)

In order to guarantee the quality of the soup and the chili oil, which are the two most important ingredients in genine Lanzhou beef noodles, Deng and his team sought out a master cook who had 30 years of experience in making Lanzhou noodles, and visited his home several times to learn his secrets. After 8 months of experimentation, they finally achieved success – they have even obtained three national patents for their products.