Sour beer is intentionally soured or fermented with lactic acid bacteria, resulting in tart, sour flavors.
Common souring methods include adding lactobacillus, pediococcus, or Brettanomyces yeast strains. Allowing wild yeasts and bacteria to spontaneously ferment the beer is also a technique.
Acetic and lactic acid are produced during fermentation, lowering pH and giving a tangy sourness reminiscent of yogurt, lemon, or vinegar.
Main styles include Berliner weisse, gose, lambic, gueuze, and Flanders red ale. American brewers have also experimented widely with sour styles.
Hops and malt tend to take a backseat to the distinctive sour flavor profile. Fruit or spices are sometimes added to complement the sourness.
Most sour beers are aged for long periods in wooden barrels, which contributes to complexity of flavor. Stainless steel is also used.
Alcohol content varies, but many traditional sour styles are lower alcohol - 3-5% ABV. Some can be up to 8% ABV.
Tart, funky, acidic sour beers have gained popularity in recent years as craft brewers revive historical styles and innovate new variations.
They provide bright, refreshing flavors that work well with food, especially rich meats and fried dishes that benefit from acidity.
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