Brewing beer is a step-by-step process:
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The corn grits and malt are cooked and blended to create mash.
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A sugary liquid, called wort, is extracted from the mash.
The remaining solid portion of the mash, the brewer's grain, is sold as feed.
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The wort is transferred to the brew kettles, where it's boiled and hops are added.
Hops are responsible for the rich aroma and the delicate bitterness in beer.
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The wort then moves to the wort cooler.
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Sterile air is added next, along with yeast, which converts sugar into alcohol and carbon dioxide. The wort moves to fermentation tanks for a carefully controlled time period.
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Bottom yeast settles to the bottom of the tank after converting all the sugar, and the resulting beer is a lager.
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Top yeast rises to the top of the tank when it's done with the sugar, and the beer it produces is an ale.