Originally posted by smallblueplanet
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So I got a teaspoon of kefir grains and added it to a 1litre mason jar and poured in 500ml of (organic) whole milk.
If I'd just left it out on the kitchen worktops in the UK (at about 22C) it would take maybe 24-36 hours to ferment. I'd then strain the kefir grain out (it will get bigger and other grains will grow), put the strained kefir into a bottle, add 500ml of milk to the original kefir grain back in the mason jar, and go again.
Now as we don't need 500ml of kefir a day (maybe every 4 days) what I actually do is rather than leave the kefir grain and milk out fermenting I put it into the fridge. When it seems like we've nearly drunk the kefir I take the jar out of the fridge, let it 'ferment' - thicken up - strain it off and start again. It will be fermenting in the fridge but more slowly, temperature is what affects it.
Nothing complicated at all. Originally kefir was milk fermented in 'sheep skins' slung on the back of horses carried across the Eurasian steppes. How 'dirty' do you want?
I think like with sauerkraut the bacteria doing the fermenting is 'stronger' than any 'bad' bacteria might be and so it isn't ever 'off'. Now that might not be quite true, but then off milk is yogurt? You'll get what I mean when you've watched some more videos and read stuff. Basically I think like with sauerkraut it is nearly always safe but you easily know when it isn't.
Sauerkraut is also very straightforward, but does need a bit more care with the ratio of salt used - again though you can tell when it's wrong.
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