Shumai is a traditional Chinese dumpling that is commonly served as a dim sum snack in Cantonese cuisine. It is made with a wonton wrapper and a filling of meat, seafood, and vegetables. 

The most common version is Cantonese-style shumai, which are round dumplings with an open top and a filling of pork and shrimp. 

Shumai can also be found in Japan, Southeast Asia, and Australia.