The Cook > wrote:

:I can get full fat buttermilk.

I've never seen such a thing. I sort of don't see the point. but I'm
willing to believe it exists.

: I am aware of the origins of buttermilk. And it is soured, not
:spoiled. There is a difference.

Not really. It's just different bacteria. Real buttermilk is
soured by leaving it sit until it goes sour. That means you hope that
you get the right things growing in it, and not listeria. Cultured
buttermilk takes all the fun out of it.