Cask Beer, also known as “Real Beer”, is a style of beer that originated in England and has been embraced by some craft brewers. It is an unpasteurized ale that completes its maturation and clarification within a wooden cask or stainless-steel keg at the retail location where it is to be served. Clarification was traditionally accomplished by the addition of “isinglass” a generic term that covers various fish collagens and proteins. Today, many brewers use various forms of colloidal silicas. Colloidal silicas are vegan friendly and are easier to use than isinglass. When maturing beer in stainless steel, the wooden cask characteristic can be mimicked with the use of oak alternatives.