I missed that you used a teaspoon of what became overly thick buttermilk, to then create a good consistency buttermilk. I have read that you can make more buttermilk with buttermilk. I can see how one could perpetuate the buttermilk stash!
One note I want to share for anyone that doesn't know this. You can prolong milk storage in the fridge by downsizing it in to smaller containers. I've had milk last at least a month doing this. When I open a half gallon for instance, I divide it in to 2 quart jars, then as one of the quarts gets to a pint, downsize to a pint jar, then to a half pint if I'm not using it for a while. The quart that was not bieng used stays good for a long time ,then when I get in to that, keep downsizing. Like with many foodstuffs, you can keep it from going bad longer by reducing the air volume in the container/size its in.
Where do you get your starter, how is it stored, how long does it last? What I see online seems a bit pricey...trying to figure out how it saves money, but from other comments making it this way tastes better? Of course letting unpasteurized milk set out is apparently the best way but we dont have any dairies we can by unpasteurized product from.
Apparently full fat yogurt can be used too, thinning it to the needed consistency. It's a probiotic like buttermilk. I absolutely love a yogurt drink I get from the Halal market
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You pretty much have to go to a Halal market to get the stuff. Last time I was in town I bought 3 gallons and and it was on Ramadan special
The yogurt drinks in Western groceries all seem to be flavored with fruit, vanilla...and other non-flavored probiotic drinks are loaded with sugar. I've been playing with making my own version of it and its pretty good...better than store-bought buttermilk, but still nowhere near as good as the Merve Aryan. I only get in "to town" once every few months, sometimes longer otherwise I would have it in the fridge all the time.