Guan Jingde's Guanjiaduozi mutton has been recognized by everyone. 199 1 year, Guanjiaduozi mutton was recorded in Shangqiu local chronicles. In 2000, it was rated as Shangqiu traditional snack by Shangqiu Traditional Famous Food Evaluation Committee of Shangqiu Commerce Bureau. In 2003, the trademark was registered with the State Administration for Industry and Commerce with the registration number of 308989 1. In 2006, it was rated as a famous food in Henan Province. With Du Zi's mutton becoming more and more popular, Guan Jingde's name is getting louder and louder. As long as people talk about Guanjia Duzi sheep meat in Ningling County, people will immediately think of Guan Jingde. So many people came to see him, including Zhengzhou, Luoyang, Beijing, Qingdao and Shenzhen. They all want to cooperate with Guan Jingde to open a chain store. In 2003, on the eve of SARS, Liu Zunzhe, one of the directors of the National Cuisine Association and editor-in-chief of China Food News, went back to his hometown in Zhecheng County to visit relatives, and his hometown recommended him the lamb chops of Guanjia in Ningling County. As one of the leaders of the National Cuisine Association, Liu Zunzhe has tasted all kinds of famous foods. When he saw piles of mutton, he didn't know what it was and didn't want to eat it. Unable to resist the persuasion of my family, I finally ate a little. He is addicted to this food. I ate it several times and brought back 10 Jin when I returned to Beijing. After arriving in Beijing, he couldn't wait to invite several food experts to taste it. After eating, everyone praised in unison. Several people decided to invite Jing De to Beijing to discuss the issue of lamb chops.

After receiving the invitation from editor-in-chief Liu Zunzhe, Guan Jingde refused to go and politely refused him. Guan Jingde thinks he is a peasant and is very humble. He just inherited a craft from his ancestors, not to mention anything. Editor-in-chief Liu is helpless. He asked his brother from his hometown in Zhecheng County to find Guan Jingde again and again, and finally invited him.

During his three days in Beijing, Guan Jingde had a long talk with several experts, who strongly invited him to develop in Beijing. Guan Jingde said, to make lamb chops with local sheep in Henan, sheep in other places can't make this taste. Finally, several experts reached an oral agreement with Guan Jingde. Guan Jingde cooks mutton for them in Ningling, and they sell it in Beijing. But then "SARS" raged and the matter was put on hold. Until September, 2006, experts in Beijing invited him again, and Guan Jingde had gone to the appointment to discuss related cooperation matters.