Pruno

Pruno, or prison wine, is an alcoholic beverage variously made from apples, oranges, fruit cocktail, candy, ketchup, sugar, milk, and possibly other ingredients, including crumbled bread. Bread supposedly provides the yeast for the pruno to ferment. Pruno originated in (and remains largely confined to) prisons and jails, where it can be produced with the limited selection of equipment and ingredients available to inmates. The concoction can be made using only a plastic bag, hot running water, and a towel or sock to conceal the pulp during fermentation. The end result has been colorfully described as a "bile flavored wine-cooler", although flavor is often not the primary objective. Depending on the time spent fermenting (always balanced against the risk of discovery by the officers), the sugar content, and the quality of the ingredients and preparation, pruno's alcohol content by volume can range from as low as 2% (equivalent to a very weak beer) to as high as 14% (equivalent to a strong wine).

Typically, the fermenting mass of fruit—called the motor or kicker in prison parlance—is retained from batch to batch to make the fermentation start faster. The more sugar that is added, the greater the potential for a higher alcohol content—to a point. Beyond this point, the waste products of fermentation (mainly alcohol) cause the motor to die or go dormant as the yeasts' environment becomes too poisoned for them to continue fermenting. This also causes the taste of the end product to suffer. Ascorbic acid or Vitamin C powder is sometimes used to stop the fermentation at a certain point, which, combined with the tartness of the added acid, somewhat enhances the taste by reducing the cloyingly sweet flavor associated with pruno.

In 2004 and 2005 botulism outbreaks were reported among inmates in two California prisons; the Centers for Disease Control and Prevention suspects that potatoes used in making pruno were to blame in both cases. In 2012, similar botulism outbreaks caused by potato-based pruno were reported among inmates at prisons in Arizona and Utah.

...
Wikipedia