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What is “lambic” beer?

Lambics are a type of ale brewed in parts of Belgium by exposing hot wort (unfermented beer) to the outside air. Indigenous, wild yeasts and other microorganisms settle on the exposed surface of the wort as it cools and begin spontaneous fermentation. They are often sweetened with fruit flavourings and generally prized all over the world.

Source : FAQ of alt.drinks.beer