I always have buttermilk in my refrigerator, as it is a very necessary ingredient in making waffles. But recently I found it difficult to find it at the markets.
It is made locally at the Hilo Meadow Gold facility, and they seem to be having problems producing buttermilk.
It is not made of butter, so why it is named buttermilk is a mystery. It was created in the 1920s and was first the liquid after churning butter out of cultured cream. Today it is made by adding lactic acid bacteria to low fat milk. This action ferments the milk to