Grain sorghum . Leaves digestible only by ruminant animals. Tour the Tyne Brewery site for a more complete explanation, photos, and diagrams. Malted barley is then dried and ground. Malting produces amylases, enzymes that digest starch to sugar.
Fermentation produces ethanol and carbon dioxiide.
Fermentation takes 7-10 days. Product is green beer. Beers and ales are then bottle, canned, or kegged. Scotch and Irish whiskies are made from barley beers, not the same as commercial beers.