I went to school with some Dutch boys. Their families had been ejected from the Dutch East Indies in the 1950s/60s, when Indonesia gained its independence. Lots of Dutch people came to live in nearby Australia at that time. But I digress. I'd heard my Dutch friends talking about buttermilk and how much they loved it. I was looking forward to trying it for myself and had the opportunity one day, when I was visiting a friend's home. I can't begin to tell you how disappointed I was. I think I was expecting buttermilk to be thick and rich and creamy and sweet, for some reason. What I recall is that it was very tangy and tart (or was it bitter?). Maybe I got a batch that had gone off. Certainly, I never tried it again.