Kefir is a tangy, probiotic-rich drink made by fermenting cow’s or goat’s milk or water with a culture starter called kefir grains — small clusters of bacteria and yeast that resemble tiny cauliflower ...

A wooden spoon and metal strainer sit above a glass jar full of kefir. After fermentation, kefir is poured through a strainer, leaving behind gelatinous grains ...

Kefir's been quietly bubbling away for centuries (originating from parts of Eastern Europe and Southwest Asia) but only recently started getting the credit it deserves in the Western world as a ...