Gueuze

Gueuze is a type of lambic, a Belgian beer. It is made by blending young (1-year-old) and old (2- to 3-year-old) lambics, which is bottled for a second fermentation. Because the young lambics are not fully fermented, the blended beer contains fermentable sugars, which allow a second fermentation to occur. Due to its lambic blend, gueuze has a different flavor than traditional ales and lagers. Because of their use of aged hops, lambics lack the characteristic hop aroma or flavor found in most other beers. Furthermore, the wild yeasts that are specific to lambic-style beers give gueuze a dry, cider-like, musty, sour, acetic acid, lactic acid taste. Many describe the taste as sour and "barnyard-like". Because of its carbonation, gueuze is sometimes called "Brussels Champagne". In modern times, some brewers have added sweeteners such as aspartame to their gueuzes to sweeten them, trying to make the beer more appealing to a wider audience. The original, unsweetened version is often referred to as "Oude Gueuze" ("Old Gueuze") and became more popular in the early 2000s. Tim Webb, a British writer on Belgian and other beers, comments on the correct use of the term "'Oude gueuze' or 'oude geuze', now legally defined and referring to a drink made by blending two or more 100% lambic beer."

Source: Wikipedia