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Boon's Oude Geuze (previously labeled as Geuze Boon or Geuze F. Boon) is a blend of 90% mild 18-month old lambic, 5% strong 3 year-old lambic , and 5% young lambic. The final blend takes place in 25,000 liter tanks where the final blend is stored cold. At bottling, the geuze is returned to fermentation temperature in order to start a secondary fermentation in the bottle. <ref name = PalmBrew> Palm Breweries - [http://www.palm.be/pageflip/en/files/assets/downloads/publication.pdf Master Class, Palm Breweries], 2nd Edition, 2013 </ref> <ref name = GeuzeBoon> Oude Geuze Boon, http://www.boon.be/en/our-beers/geuze-boon-old-style (English) </ref>