Tasting Manual: The highly subtle, elegant and gentle flavour of Traditional Oude Geuze, VAT 91, is due to foeder no. 91, which used to serve as a calvados cask in Normandy. Now this foeder produces an excellent, gentle Lambic, which is just perfect for Traditional Oude Geuze. VAT 91 is soft, full bodied, complex and well balanced. The unique oval shape of foeder no. 91 provides optimal use of warehouse space.