What airag is
Airag is a drink made from fermented mare’s milk. It is closely tied to summer in Mongolia, when mares are milked several times a day and families have plenty of fresh milk. The drink is slightly sour, a little fizzy and usually thin, with a cloudy white appearance. Its alcohol content is generally low, though it varies with how long it has fermented. In Russian and Central Asian contexts, a similar drink is known as kumis, and it has a long history across the steppe.
Fermented mare’s milk is considered a seasonal specialty. You are most likely to meet it from early summer to early fall, and often at the countryside camps of herder families, along roadside stalls and at large gatherings such as the Naadam festival.
How it is traditionally made
Mare’s milk is naturally lower in fat than cow’s milk and has a different sugar balance, which is part of why it ferments into this particular drink. In the traditional method, fresh milk is poured into a large leather bag, often made from hide. Fermentation begins with a starter from an earlier batch, and the bag is hung inside or near the entrance of the ger.
The key step is stirring. A long wooden paddle is used to churn the contents again and again, and anyone who enters the ger may give it a few turns in passing. This regular agitation is part of what gives the drink its character. Over a day or more the milk sours and develops its slight fizz. Precise timing, temperature and technique differ from family to family, and each household tends to have its own preference.
Modern producers also bottle airag, and urban sellers may use plastic containers rather than leather, but the principle of fermenting and agitating milk remains the same.
Its place in Mongolian culture
Airag is more than a refreshment. It is a drink of hospitality and celebration. At summer gatherings, it is ladled from a large container into bowls and passed around. A guest in a ger will often be offered a bowl, and by tradition it is polite to accept it with the right hand, or with the right hand supported by the left, and to take at least a sip. This falls within the wider customs described under Mongolian etiquette.
Mares and horses hold a special position in Mongolian life, and the drink reflects that. Many people see airag as part of what makes summer on the steppe what it is, and it is sometimes used in rituals, such as sprinkling a little to the sky or ground as an offering. As ritual practice varies by family and region, it is best to watch what your hosts do and follow their lead.
What it tastes like
Reactions from first-time tasters vary. Common descriptions include sour, tangy, yeasty, milky and mildly fizzy, sometimes compared to a thin sour yogurt or a cider-like drink. Some people enjoy it immediately, many find it an acquired taste, and a few simply do not like it. All of these responses are normal, and hosts are generally used to them.
Texture and strength also vary from batch to batch. A drink fermented for longer may be sharper and slightly more alcoholic than one served fresh. If you are not sure, try a small amount first.
Practical points for visitors
- It is fine to take a small sip and hand the bowl back if you do not want more. Declining politely is usually understood, but a simple taste is a pleasant gesture.
- Drinking a lot at once may upset some stomachs, particularly when your body is not used to rich or fermented dairy. If you have a sensitive digestive system, lactose intolerance, are pregnant or have a medical condition, take care and consider asking a doctor before travel. This article does not make health claims for or against the drink.
- Because it contains some alcohol, remember this if you are driving, riding or have reasons to avoid alcohol.
- Hygiene standards at roadside stalls vary. General advice on food safety applies, and travelers often prefer to try it at a well-established camp or with a family they know.
A note on other fermented milk drinks
Airag should not be confused with other milk products. Distilled milk spirit is a different product. Yogurt, cultured cream and curds belong to the wider dairy tradition that fills summer diets. Airag is distinctive because it is made specifically from mare’s milk and left to ferment while being stirred.
Why it is worth trying once
Even if you do not finish the bowl, airag gives a taste of how herding families use what the season gives them. Summer is short, and the products of the animals matter in a direct way. Trying it, in the right setting and with a host who can explain it, is a modest but memorable part of visiting the Mongolian countryside.