Sentence:  Buttermilk also tastes different today. What do people do when they make buttermilk for the public that gives buttermilk that <WSD>twang</WSD> taste? Do these people put milk in an aging tank to mature like wine in a place where air and germs can't get to it? 
Meaning of the word marked with <WSD> tags:  A sharp, disagreeable taste or flavor.