If you don't know what kefir is, it is sort of like plain yogurt, 'cept you drink it. (Two weeks ago, if you were to ask me what kefir was, I would have said, "It's what we call my cousin, the second born son of my father's brother." His name is actually Keith.)
I combined and warmed Half and Half (note the extremely cute, vintage-styled milk bottle it comes in) and organic whole milk (pasteurized, but not ultra-pasteurized) with the kefir starter grains and am now storing it at room temp in the microwave for the first 24 hours. Then I am supposed to strain it and let it sit another day.
Adventures in home chemistry. Wheee!