Ayran or airan (from Turkish ayran ) is a drink made of yoghurt and water, popular in Turkey, Armenia, Azerbaijan, Bulgaria, Iran, Lebanon, and other parts of the Balkans, the Middle East, and Central Asia. It is similar to Armenian tahn and Iranian doogh, though doogh can be naturally-carbonated. In Cyprus, it is referred to as ayrani.
It can also be made with cucumber juice in place of some or all of the water, or flavored with garlic. It may be seasoned with black pepper, although this is uncommon in Bulgaria, where ayran is also often served without salt. Another recipe popular in some regions includes finely chopped mint leaves mixed into the ayran. In countries such as Bosnia and Herzegovina, extra salt is added to give the drink the flavour of salt water and is often consumed in large quantities at Turkish eateries.
Ayran is so popular in Turkey that it rivals the sales of the juice and soda industries. International fast-food companies, such as McDonald's, include Ayran in their standard menu. In Azerbaijan, Iran, Syria, and Lebanon, it is available in most restaurants and fast-food shops. In other countries, it may be found at döner kebab outlets. In the United States, it's available in Turkish, Persian, Armenian and other Middle Eastern stores under the names ayran, doogh, or tahn.
In rural areas of Turkey, ayran is offered as a standard drink to welcome guests.