This is pig kidney. Wangjing waist is the kidney of a pig. It is a popular kebab in Beijing, China, which originated from Wangjing, Beijing. Wangjing Xiaoyao is to string a small piece of pork loin with bamboo sticks, then roast it on charcoal fire and sprinkle with spices such as cumin and Chili powder. It tastes delicious and juicy and is deeply loved by consumers. Pig kidney is the kidney of pig, which has the effects of tonifying kidney and yin and regulating kidney qi.