Suanmeitang

Suanmeitang or sour prune drink is a traditional Chinese beverage made from smoked plums, rock sugar, and other ingredients such as sweet osmanthus. Due to the sour plums used in its production, suanmeitang is slightly salty in addition to being sweet and rather sour.

Suanmeitang is commercially available in China and other parts of the world with Chinese communities. It is often drunk chilled during the summertime, as relief from the heat, and is one of the most common summer drinks in China. In addition to being widely considered an effective drink for cooling off in the heat, it is also popularly believed to have minor health benefits, such as improving digestion and possibly inhibiting the buildup of lactic acid in the body.

History
Suanmeitang has existed in some form for over 1,000 years, at least since the Song dynasty (960–1279 CE); there are also reports of a variation called "white suanmeitang" (白酸梅汤) during the Yuan dynasty (1271–1368 CE). The recipe used today is thought to have been developed at the request of the Qianlong Emperor of the Qing dynasty during the early 18th century, at which time it was first common in the imperial courts, and was later popularized among common folk when a Hebei citizen created and produced the Xinyuanzhai (信远斋) brand. By the 1980s, companies had begun to use industrial methods and technology to mass-produce suanmeitang.

Ingredients and production
Suanmeitang is made by first soaking sour plums in water, then adding haw, liquorice root, and sweet osmanthus and boiling them together. Rose blossoms may also be added. After the mixture is boiled, rock sugar is added to the residue, it is boiled again, and after the beverage has cooled off it is chilled.