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Sour Asylum #3: Oud Tannenbaum is the third in our ongoing series of lacto-fermented sour ales. Lactobacillus is added to the brew kettle lending a mild acidity to this brown ale. And in the spirit of this season when tinsel is hung and carols are sung around the Christmas tree, this tart brown ale is matured on cedar, enhancing the dark malts and imparting a dry cedar character to the finish.