Brewer's ingredient is an essential part of the beer-making process. Malt, YEAST, and hops are all key ingredients in the production of beer. Malt is a grain that is germinated and dried to create a sweet flavor. YEAST is a microorganism that helps to ferment the beer and give it its unique flavor. Hops are a flower that is used to add bitterness and aroma to the beer. All three of these ingredients are essential for creating a quality beer.