Airag, also called Kumis or Ayrag is a fermented dairy product made from raw mare's milk. It is the traditional drink for many people of Central Asia, particularly of Huno-Bulgar, Turkic and Mongol origin. The milk can be mildly alcoholic, but it needs to be consumed in enormous quantities to have any noticeable effect.
The milk is fermented by a combination of lactic acid bacteria and yeast in a horse-hide container, called a "saba". Since, the milk is fermented; Airag is suitable for lactose intolerant people. The taste of the milk is sour, but can be quite yummy. Airag is used to make cheese, yoghurt.
Other cheeses from Mongolia: Byaslag
Other cheeses from Turkey: