Hong dou tang (紅豆湯), hong dou sha (紅豆沙), or red bean soup is a sweet Chinese dessert soup made from azuki beans. It is served in Mainland China, Taiwan, Hong Kong, Macau, and places with Chinese diaspora. It is categorized as a tong sui, or sweet soup. It is often served cold during the summer, and hot in the winter. Leftover red bean soup can also be frozen to make ice pops and is a popular dessert.