Hui Gan

Hui Gan (回甘) is a term used extensively in Chinese tea description, but rarely anywhere else. The concept is composed by two characters, each with its significant meaning: Hui - return; Gan - sweetness. It is phenomenon to describe when the taste bugs are stimulated by the various compounds in the tea brews, it causes a refreshing, sweet and refreshing aftertaste, often accompanied by pleasant salivation. The sweetness here is often subtle and natural, rather different from the sweetness sugar or honey. A premium tea's Hui Gan can linger a long time after a tea is consumed.

Various varieties of Chinese teas have various levels of Hui Gan. For example, the most potent Hui Gan is found in the Taiwan high mountain Oolong and the raw Pu-erh teas. 

Hui Gan is a sought after quality when Chinese teas are evaluated and graded.