Why do Chinese restaurants not serve lamb?

Chinese cuisine varies widely by region, and lamb is not as commonly used in many traditional Chinese dishes compared to other meats like pork, chicken, and beef. However, lamb is more prevalent in specific regions, particularly in the northwest, where ethnic groups such as the Hui and Mongols incorporate it into their culinary traditions. The absence of lamb in many Chinese restaurants outside of these regions is largely due to local preferences and the types of dishes that are popular in those areas. Additionally, lamb may not be as readily available or as cost-effective in some markets.