Flanders Brown Ale (Belgian-Style Oud Bruin)
A style of beer originating from the Flemish region of Belgium. The Dutch name refers to the long aging process, of up to a year. It undergoes a secondary fermentation, which takes up to a month, and is followed by bottle aging for several more months. This allows residual yeast and bacteria to develop a sour flavor. Usually, cultured yeast and bacterias are used. These beers were kept as so called provision beers, to be stored and allow the flavor to develop.