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I've tried to made home-made yogurt. I've tried to follow the receipt first by pasteurizing milk to kill the bacteria, waiting until the milk is 107 degree and adding culture. I've used incubator for 4 h (as indicated on culture pack).

I've got a rather sour cream at the bottom and the rest was soured milk. While I don't mind it and I haven't drank it in ages that wasn't what I was looking for.

Maciej Piechotka
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Either you failed to adequately pasteurize the milk, or your culture was bad, or some unclean / unsanitized (some would say sterilized, I know better) utensil was involved on the cooling/inoculating side of the pasteurization step.

4 hours is a remarkably short incubation time - were you aiming for a "liquid/drinkable" yogurt? For a set yogurt 8-12 hours is typical and my process at this point is 24 hours at a somewhat lower temperature (95-100F) as I like the result better than the warmer/shorter incubation.

Ecnerwal
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    Incubation time depends on the specific culture, temperature, and how much starter is used. I agree that 4 hours is short (perhaps too short here?), but it's not unheard of in yogurt recipes. – Athanasius Jun 28 '16 at 17:29