There are many food shops in Zhongshan. The following are some food shops that may have pork belly chicken:

1. Lihe Restaurant: Lihe Restaurant is one of the famous food brands in Zhongshan, which is famous for its unique cooking techniques and delicious dishes. Pigeons, crispy pork hands, Dongpo pork and other dishes here are all worth a try.

2. Yongle Restaurant: Yongle Restaurant is an old-fashioned restaurant in Zhongshan City, mainly serving Cantonese cuisine. The food here is of high quality, authentic taste and very popular.

3. Xidefeng Tea Restaurant: Xidefeng Tea Restaurant is a restaurant with the theme of Hong Kong-style tea restaurant. The dishes here are rich in variety, authentic in taste and affordable.

4. Hejuteng Restaurant: Hejuteng Restaurant is a restaurant that specializes in Sichuan cuisine. The Sichuan cuisine here is very authentic, full of flavor and distinctive.

5. Other snack bars: There are many other snack bars in Zhongshan, and there may be such delicacies as pork belly chicken. You can choose according to your own tastes and needs.

please note that the above information is for reference only, and you need to try and feel the dishes and taste of the specific food shop yourself.