The highly subtle , elegant and gentle flavor of traditional Oude geuze, Vat 91, is due to foeder no.91 which used to serve as a calvados cask in Normandy. Now this fielder produces an excellent gentle Lambic, which is just perfect for traditional oude geuze. Vat91 is soft , full bodied, complex and well balanced. The unique oval shape of foeder no. 91 provides optimal use of warehouse space.