I used to really like buttermilk as a kid. We never had farm fresh milk, and the buttermilk always came in a carton, but I do remember that it used to have tiny flakes of butter in it. Today, the supermarket buttermilk never has butter flakes in it....I guess they got more efficient in separating the butter from the buttermilk. It doesn't usually seem to have the same tang to it that I remember, but I still like it sometimes. We normally only use buttermilk when making thin "fried" cornbread, so a quart will often go bad on us before it all gets used, especially since the DW decided the shortening rich cornbread was bad for me.
Chuck