Beer

There are four crucial ingredients in the production of beer: water, barley malt, hops, and yeast.

An excerpt from the article 20 facts about beer

The process of creating beer begins with malting the fresh barley. Secondly, soaked barley is milled to ensure it dissolves in water properly. Then it undergoes mashing and is later filtered to extract wort. Wort is then boiled and seasoned with hops which determine the taste of the final product. Once the yeast is added, it undergoes fermentation, which can last for several months.