Oude Geuze Boon is a monument of taste. It�s a magnificent blend of 90% mild 18 month-old lambic, 5% strong 3 year-old beer and 5% very young lambic, which provides fermentable sugars and wild yeasts. Aged in oak casks, before bottling, the mix is brought to fermentation temperature. The bottles are then placed in an air-conditioned room, which leads to a secondary fermentation in the bottle. This is when the lambic becomes geuze. After several months of ageing in the bottle, the geuze develops its delicate flavour.