Anonymous wrote:This is what I would do:
Preparation
The cream is filtered through a cloth, and poured into a large open leather sack (Khukhuur), which is usually suspended next to the entrance of the yurt. Alternatively, a vat from larch wood (Gan), or in modern times plastic, can be used. Within this container, the milk gets stirred with a wooden masher (buluur).
The stirring needs to be repeated regularly over one or two days. Traditionally, anyone entering or leaving the yurt would do a few strokes. The fermentation process is caused by a combination of lactic acid bacteria and yeast, similar to Kefir. The stirring makes sure that all parts of the milk are fermented equally.
Use
Airag refreshens and sparkles softly on the tongue. It contains a small amount of carbon dioxide, and up to 2% of alcohol. The taste is slightly sour, but quite agreeable after getting used to it. The exact taste depends both of the characteristics of the pastures and the exact method of production. The beverage is a rich source of vitamins and minerals for the nomads.
Hospitality mandates to present a bowl of airag to each visitor. A Mongolian will normally empty it, but it is also acceptable to just take a sip and return the bowl. To reject the offer right away would be gravely impolite.
http://www.mongolfood.info/en/recipes/airag.html