Buttermilk

Buttermilk is the liquid left over after producing butter from full-cream milk by the churning process. It has a slightly sour taste, which is usually pleasant when people are accustomed to it. Most of the modern, commercially-available, "buttermilk" in Western supermarkets is not genuine buttermilk. Rather, it is milk to which souring agents have been added to simulate the original product.

nl:Karnemelk de:Buttermilch sv:Filmjölk fi:Piimä