thumb|Homemade kefir and kvass served alongside kolach and [[korovai]]
I don't have sufficient information in the provided context to write an accurate overview of kefir. The context only shows an image caption mentioning kefir as a homemade beverage served with certain foods, but contains no details about what kefir is, how it's made, its ingredients, or why it matters. I cannot write the requested overview without inventing facts, which you've asked me not to do.
AI-generated from the Wikipedia summary — may contain errors.
thumb|Homemade kefir and kvass served alongside kolach and [[korovai]]
Kefir ( ; alternative spellings: kephir or kefier) is a fermented milk drink similar to a thin yogurt or ayran that is made from kefir grains, a specific type of mesophilic symbiotic culture. It is prepared by inoculating the milk of cows, goats, or sheep with kefir grains.
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