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Mine has never smelled bad, and I have no idea of why yours does. The longer you keep the milk the sourer it gets, at least that's what I read. I have some that's several days old, it tastes a little more sour but nothing really notable, just a very mild lemon taste.
By a bad smell, I mean of the area where my jars are stored when I'm growing the grains past 24 hours. . .
We usually grow ours to 24 hours, then refrigerate it to slow/stop the growth process. That stuff gets consumed, and is a strained version of what is grown. We basically grow the grains in the milk, strain the milk out and drink that, then place the grains in fresh milk, then start the cycle over again.
The Kefir we use for drinking (basically milk with tiny particles of Kefir left) doesn't stink at all unless it has been refrigerated too long.
I do agree with the old saying though, it is like a champagne of the gods.
Oh, and of course the best type of Kefir is from extra-rich milk. If you've got milk with a high amount of cream/butterfat (my goats produce about 7-8%; Cows produce 3%) it actually makes the Kefir a lot more thick, creamy, and less sour in taste.