I almost forgot the airag (fermented mare's milk)

Whoops! While I was putting up the other Mongolian food posts, I very nearly forgot to include the airag, fermented mare's milk. It's a thin, relatively sour and acidic beverage with a flavor that seemed closest to an extremely tart yogurt. It has a good fizz and a light but noticeable alcoholic kick. The first sip is awful; the second is mildly disturbing. The third is awesome.