In the second in my Fermented Foods series: Kefir.
Kefir is a thick fermented milk beverage. Like yogurt, kefir also has the protein and calcium, however the method of fermentation and the types of organisms differ from yogurt. A kefir grain is used in the fermentation process and the products of that process are 1% alcohol as well as yeast.
You can find Kefir at most health food grocery stores.
Image courtesy of Danilo Rizzuti at FreeDigitalPhotos.net