Before the advent of refrigeration and advances in the science of fermentation in the mid-nineteenth century, almost all beer was, to varying degrees, sour. The culprits were pre-modern sanitation and poorly understood, often naturally occurring bacteria including Lactobacillus and Pediococcus, as well as Brettanomyces yeasts, which can contribute a hint of tartness and characteristic “funky” flavors and aromas, sometimes compared to leather, smoke, and “horse blanket.” In a development that would make Pasteur, the father of biogenesis (as well as his method for halting it, pasteurization) roll in his grave, brewers, especially in the United States, have embraced the time-honored Belgian art of deliberately infecting beer with the same “wild” bugs that generations of their predecessors so painstakingly eradicated. The result: pleasingly sour, food-friendly beer, mysteriously complex and engaging.
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