The main ingredients are broccoli and Niu Huanxi, which is the reproductive organ of a female cow and is called Niu Ersi in some places. It is a common ingredient in Guangdong and Guangxi, and is usually used for stir-fry or hot pot. Stir-fried Beef Happiness with Broccoli is a popular Cantonese dish. It should be noted that Niu Juanxi is a special ingredient that may not be accepted by everyone.