Airag is the national drink. It is fermented mare's milk, slightly alcoholic, and the dish your nomad host will offer first. Here is its 3,000-year story, what it tastes like, and the etiquette of accepting the bowl.
Bayartsogt Ganbold
Airag is fresh mare's milk fermented in a leather bag (khokhuur) for two days at ambient temperature. Native lactobacilli convert lactose into lactic acid; wild yeasts contribute a small alcohol content (about 2 percent). The result is sour, tingly, slightly fizzy, and astonishingly nutritious. Mongolian children grow up on it.
Pollen and lipid analysis of skeletons from Bronze Age burial mounds in Mongolia shows airag drinking by 1200 BCE. Genghis Khan's army drank it on campaign. The 13th-century traveller William of Rubruck described his first taste with a memorable mix of disgust and respect.
Like a cross between fizzy yoghurt and sour cider, with grassy notes from whatever the mare grazed that day. Acquired taste for foreigners. Most love it by the second bowl.
Right hand bowl, left hand support. Three fingers raised toward the sky as a blessing. Sip, do not gulp. If you cannot finish, take three sips minimum, then return the bowl to the host. Refusing entirely is a major breach.
July to October is peak season. Outside that window, you may be offered fermented camel milk (khoormog) or fermented yak milk instead. Same etiquette.
By the same families, in the same khokhuur bags, with the same wooden churning paddles their grandmothers used. We visit a maker family near Otugi Camp on every Khangai itinerary.
The 2 percent alcohol content is real. Pregnant guests should decline politely. Non-drinkers can sip ceremonially without finishing. Hosts will not be offended if you explain.