The Funkwerks sour beer program was launched in early 2012 to produce traditional beers of the Flemish region of Belgium. Oud Bruin is our traditional Flemish style sour produced from a blend of beers aged for up to 2 years from a variety of oak barrels. Long, slow fermentation with a blend of Brettanomyces, Lactobacillus and other sour cultures contribute the characteristic tart flavor. The Funkwerks sour beer program was launched in early 2012 to produce traditional beers of the Flemish region of Belgium to appease the current and future sour enthusiasts. Pucker up.