3 Fonteinen Oude Lambik is the result of a specific brewing process with a high proportion of unmalted wheat, spontaneous fermentation in an open coolship, and slow and complex fermentation and maturation in oak barrels of different sizes and shapes. This beer is completely flat as the carbonation evaporates through the wooden staves. Please note the age of the sample you are reviewing when entering your rating. 3 Fonteinen Oude Lambik is considered all 3 Fonteinen lambic above 18 months of oak barrel maturation after brewing, and every blend of young and old lambic, prior to bottling and bottle evolution to geuze. It is poured in some selected places, and in the lambik-O-droom on dedicated hand pumps. As it is unfiltered and unpasteurised, the time between the oak barrel and the serving moment is kept as short as possible.