Ginger Beer

Modern ginger beer is a sweetened and carbonated, usually non-alcoholic beverage, a type of soft drink. Historically it was a type of beer brewed by the natural fermentation of prepared ginger spice, yeast and sugar. Modern ginger beers are often manufactured rather than brewed, frequently with flavour and colour additives, with artificial carbonation. The related ginger ales also are not brewed.
Ginger beer is still produced at home using a type of symbiotic colony of yeast and Lactobacillus bacteria (SCOBY) known as a "ginger beer plant", or from a "ginger bug" starter created from fermenting ginger, sugar, and water.

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3 Ingredient Homemade Fermented Ginger Beer by Joshua Weissman.