Ginger beer is a type of carbonated alcoholic beverage or soft drink, flavored primarily with ginger, lemon and sugar. It originated in England in the mid 1700s, and it reached its peak of popularity in the early 1900s. The original recipe requires only ginger, sugar, and water, to which is added a gelatinous substance called "ginger beer plant". Fermentation over a few days turns the mixture into ginger beer. Lemon may be added.
This is Wikipedia's definition. http://en.wikipedia.org/wiki/Ginger_beer
All I know is I love GINGER BEER!. If you have a tummy ache this is usally one of the remedy's that your parents would give you. As you can see by the ingredients it doesn't take that much to make it.
I use the ginger plant as a tea sometimes