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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 the lambic products 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 or Vielle lambic and Viellegueuze]</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.