Alcoholic drink which contains a very high level of alcohol and "does not contain any added flavoring" is commonly called a neutral spirit. Generally, any distilled alcoholic beverage of 170 US proof or higher is considered to be a neutral spirit. Most yeasts cannot reproduce when the concentration of alcohol is higher than about 18%, so that is the practical limit for the strength of fermented drinks such as wine, beer, and sake. However, some strains of yeast have been developed that can reproduce in solutions of up to 25% ABV. Shot sizes vary significantly from country to country. In the United
Barley The preparatory "kykeon" or mixed drink of the initiates, prepared from barley and herbs, referred in the Homeric hymn to Demeter, whose name some scholars believe meant "Barley-mother". The practice was to dry the barley groats and roast them before preparing the porridge, according to Pliny the Elder's "Natural History" (xviii.72). This produces malt that soon ferments and becomes slightly alcoholic. Pliny also noted barley was a special food of gladiators known as "hordearii", "barley-eaters". However, by Roman times, he added that wheat had replaced barley as a staple. Tibetan barley has been a staple food in Tibetan cuisine since