where did the first kefir grains come from
Kefir Kefir or kephir (/kəˈfɪər/ kə-FEER),[1][2] alternatively milk kefir or búlgaros, is a fermented milk drink that originated in the Caucasus Mountains made with kefir "grains", a yeast/bacterial fermentation starter.[3] It is prepared by inoculating cow, goat, or sheep milk with kefir grains.[4] Traditional kefir was made in goatskin bags that were hung near a doorway; the bag would be knocked by anyone passing through to help keep the milk and kefir grains well mixed.[5]