Kwok's Best is a private restaurant under Nanjing Renjian Jiapin Catering, which opened in 2007 and was renamed "Guo's Private Cuisine" when it was renovated in 2018. The restaurant wants to take the route of high-end private dishes, focusing on business banquets and private customization, and takes the famous Tang Dynasty general Guo Ziyi as the historical and cultural image of the restaurant. The founder of the restaurant, Guo Jiagui, claims to be the queen of Guo Ziyi, but there is no way to verify it, and it is recommended that diners pay more attention to the quality of the dishes.

The dishes in the store are based on Huaiyang cuisine and Hui cuisine, and integrate the characteristics of local cuisines. In order to meet the needs of guests who love to eat game, the restaurant mainly uses high-end ingredients such as crocodile, soft-shelled turtle, roe deer, pufferfish, and chicken fir. The braised soft-shelled turtle is served in a hollow copper pot and continues to simmer slowly over low heat after serving, so as to prevent the gelatinous coagulation of the soft-shelled turtle from affecting the taste. The soft-shelled turtle is large and has a lot of meat, and the meat is soft and tender; The sauce seeps into the fish, and the earthy smell of the soft-shelled turtle itself is masked, and the umami is prominent, salty but not salty. Nanjing people like to eat puffer fish, the warm pot jade noodle puffer fish is made of chrysanthemum yellow porpoise, and the soup is made of puffer fish skin and liver; Slice the skinned puffer fish and take it out for a few seconds to eat, it tastes delicious. The restaurant claims that its ingredients are wild-caught, believing that wild ingredients have a higher nutritional value than farmed ingredients. In fact, whether it is wild or farmed, the nutritional value of the same type of food is comparable, and there is not much difference. At present, most of the ingredients such as soft-shelled turtles are supplied by farms, and there are very few real wild soft-shelled turtles, and the number is so small that it is difficult to find.

The "Zhen" of Kwok's Best is not only reflected in the ingredients, but also in the restaurant environment. The renovated restaurant is still based on Chinese classical style, with modern decoration and accessories as a match, and the environment is suddenly elegant and pleasing to the eye. The intimate service, warm attitude, and quick hands and feet are a plus compared to other restaurants.