"Three steaming" originally refers to steaming fish, meat and vegetables. Some people say that "Mianyang Three Steams" means steamed pork, steamed pearl Zi Yuan and steamed white balls, while others say that "Mianyang Three Steams" means steamed herring, steamed pork and steamed vegetables. In fact, these statements are biased. The correct statement should be: "Mianyang Three Steams" refers to the floorboard of steamed livestock, steamed aquatic products and steamed vegetables.

Yangsanzheng is one of the traditional famous dishes of Han nationality in Mianyang, Hubei Province (now Xiantao City), belonging to Hubei cuisine. This dish is tender and soft; Original flavor; Light; Soft. It is a pearl in Hubei cuisine and occupies an important position in China famous cuisine. Mianyang people love to eat steamed vegetables and have the custom of "steaming without vegetables", which is called the hometown of steamed vegetables.