store-bought yogurt question...
I've just been lurking in here; got a link from somewhere in N&GE. Y'all have a lot of good info I'm thinking of incorporating into my and husband's diets.

Regarding:
Quote:
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Originally Posted by EBG
Store-bought yogurt is not lactose-free because they don't ferment it long enough (24 hours or more).
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Would it be possible to purchase a good quality, organic, whole milk yogurt, then leave it out on the counter to culture some more? Through experience, I've left bowls of yogurt out and eaten them hours later and they're more tart than when first served. I've also made yogurt for 2 children who like it different ways - the younger likes it after a 9 to 12 hour culture, the elder prefers a 20-24 hour culture. At times I've forgotten to leave half of it out longer for D., and took it back out of the fridge and left it on the counter overnight again; it always gets that nice tart flavor he really enjoys.
My presumption has always been that the bacteria/enzymes just ate up more of the lactose when it warmed up again. Perhaps if you left store-bought yogurt at room temp for 24 hours it would get it to (or at least closer to) where you want it?
I've never used a "yogurt maker" or "yogurt machine". I make my yogurt using glass mason jars or quart yogurt containers from previous store-bought yogurt (or sometimes I just leave it in the stainless steel pan to culture) and an insulated cooler. Well, and a $3 candy/frying thermometer, but before I bought that I just used a regular digital thermometer, since mine would register up to 110 degrees - I heated the milk 'til small bubbles ringed the pan, then cooled, checking with a regular thermometer. I've also heard that you can tell when it's ready by the ring of tiny bubbles - that's 180F, then when you can leave your finger in the pot of milk for ten seconds (but no more), it's about 110F and ready for the culture. I've done it that way a number of times when making yogurt for the boys and I've forgotten to bring my thermometer to their house and it's turned out fine, though not as consistantly thick and creamy as when I use a thermometer. Sometimes it's more runny, sometimes a bit grainy, but it always cultures - I assume (through my reading) that the texture differences are mostly due to starting with raw milk and not getting it hot enough to kill off all the natural enzymes. Whatever it is, it still tastes good. *grin*
Anyway, my husband received a soft-sided cooler designed to hold 12 20oz (I think they're 20 oz) Monster brand energy drinks, and it's the perfect size for either 2 quart-sized plastic yogurt tubs *when standing up* or my 2qt pot *when on it's side*.
While the milk is heating then cooling, I stick a milk/water jug filled with hot water from the tap (as hot as it can get) in the cooler. When the milk's ready to culture I take out the hot water bottle, wrap the pot/tubs in a piece of fleece, stick it in the cooler, then stuff up any open spaces with plastic grocery bags. Zip up, leave overnight, and I have nice, thick yogurt in the morning. I personally use Sky Top Farms yogurt as my culture and it's so creamy I'll eat the yogurt warm (but that's not what y'all are looking for!).
Recently, I've also had good luck using an insulated lunch bag to make up one plastic tub of yogurt, using the same method described above, minus the fleece. Actually, I almost never remember to put the hot water bottle in first anymore and it still turns out great.
Maybe you could get store-bought to culture more (for people who are unable to start from scratch for whatever reason) if you stick it in a pan of warm water that you keep at 106-110F until the yogurt is in that range as well, then try an insulated method of keeping it warm for an additional 12-24 hours?
Hmm. Maybe I'll give that a try right now with a cup of the yogurt that finished this morning.
Anyway, I'm rambling, but can anyone think of a reason why either way wouldn't work? I wish there was a way to test the activity content of homemade yogurt!
~Kissy, a beginning culture queen - yogurt, kombucha & sourdough pancakes under her belt. Next stop - water kefir, pickles and ginger carrots - yipee!

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