Backset
De Wikignôle.
Backset (also called thin stillage, or dunder) The liquid left in the still after distillation has completed. Essentially backset is a weak, acidic beer which has been boiled for a number of hours. Backset is used to create sour mash whiskies.
Backset is useful as Distillers Dried Grains (DDG) as feed for livestock, and is also useful as fertilizer.
