Stout is a dark beer made using roasted malt or roasted barley, hops, water and yeast.
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The term
The first known use of the word stout for beer was in a document dated 1677 found in the Egerton Manuscript, the sense being that a stout beer was a strong beer not a dark beer
History
Porter originated in London, England in the early 1720s. The style quickly became popular in the City especially with porters (hence its name): it had a strong flavour, took longer to spoil than other beers, increased in alcohol content with age, was significantly cheaper than other beers, and was not easily affected by heat. Within a few decades, porter breweries in London had grown "beyond any previously known scale".[7] Large volumes were exported to Ireland, where by 1776 it was being brewed by Arthur Guinness at his St. James's Gate Brewery.