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Lambics are [[Spontaneous Fermentation|spontaneously fermented]] beers native to the Senne Vally of Belgium which are made from barley malt and unmalted wheat (30-40%) and aged hops. They form the base of a number of lambic products including unblended lambic, [[gueuze]], and fruit lambics including kriek and framboise. Lambic (and lambic products such as Gueuze and Kriek) labeled 'Oude' or 'Vielle' are protected in the EU and are required by law to meet certain conditions including average age, minimum OG, max pH, max bitterness, max isoamyl acetate level <ref>[http://ec.europa.eu/agriculture/quality/door/registeredName.html?denominationId=739 EU law for Oude and Vielle]</ref>. In practice the presence or absence of this term can help the consumer determine which products will likely be back-sweetened and which will be traditional.

[[Gueuze]] (also written geuze) is a blend of lambics, traditionally 1 year old, 2 year old and 3 year old which undergoes bottle conditioning to become a highly carbonated product. Some producers release blends labeled gueuze that involve blends of lambics of different ages than 1, 2 and 3 years. Gueuze and lambic labeled 'Oude' or 'Vielle' are protected in the EU and are required by law to meet certain conditions including average age, minimum OG, max pH, max bitterness, max isoamyl acetate level <ref>[http://ec.europa.eu/agriculture/quality/door/registeredName.html?denominationId=739 EU law for Oude and Vielle]</ref>. In practice the presence or absence of this term cna help the consumer determine which products will likely be sweetened and which will be traditional. Not all producers follow this the oude/vielle protected name designation and some traditional gueuze can be found without the label Oude or Vielle.