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Shandy is beer mixed with a lemon flavoured beverage, often lemonade, usually half lemonade and half beer, resulting in a lower ABV for the finished drink. Shandies are popular in Europe, Australia, New Zealand, South Africa, and Canada. In some jurisdictions, the low alcohol content of shandies exempts them from laws governing the sale of alcoholic beverages. The debated origin of the term is shortened from shandygaff, from Britain in 1853 and itself of obscure source.
Source: Wikipedia