Kumis

Kumis , alternatively spelled coumis or kumyz,[a] also known as airag (/ˈaɪræɡ/ EYE-rag),[b] is a traditional fermented dairy product made from mare milk. The drink is important to the peoples of the Central and East Asian steppes, of Turkic and Mongolic origin: Kazakhs, Bashkirs, Kalmyks, Kyrgyz, Mongols, and Yakuts. Kumis was historically consumed by the Khitans, Jurchens, Magyars, and Han Chinese of North China as well.

Source: Wikipedia