Kefir
Kefir or kephir (/kəˈfir/ kə-FEER), alternatively milk kefir, or búlgaros, is a fermented milk drink that originated in the north Caucasus Mountains made with kefir “grains”, a yeast/bacterial fermentation starter. It is prepared by inoculating cow, goat, or Sheep milk with kefir grains. These are not grains in the conventional sense, but cultures of yeast and lactic acid bacteria that resemble a cauliflower in appearance. Over a period of 24 hours or so, the microorganisms