Beer is a popular alcoholic beverage that is made from a variety of ingredients. The most common beer ingredients are BIRCH, malt, hops, YEAST, BARLEY, and RYE. BIRCH is a type of tree that is used to add flavor to beer. Malt is a grain that is used to provide sweetness and body to the beer. Hops are a flower that is used to add bitterness and aroma to the beer. YEAST is a microorganism that is used to ferment the beer. BARLEY is a grain that is used to provide flavor and color to the beer. RYE is a grain that is used to add flavor and body to the beer. MASH is a mixture of grains that is used to extract sugars for fermentation. All of these ingredients are essential for making beer.