As any brewmaster or beer drinker can tell you, “sour” and “beer” are two words that generally don’t go together. Whether it’s a nasty funk caused by an infected yeast strain, or off-flavours in a cask ale that’s been tapped for too long, sourness is not a welcome characteristic in the flavour profile of most beers.
But that’s not to say that all sour beers are bad. There are some beer styles, in fact, where sourness isn’t just allowed, but actually expected. The most well known of these are the lambics of Belgium, beers that are brewed in a centuries-old traditional fashion where the wort (essentially a barley soup that is made at the beginning of the brewing process) is left in open fermentation tanks and exposed to wild yeasts rather that using the stable cultivated cultures used in most beer. The inoculated liquid is then transferred to oak barrels where it ferments and ages for 2 years or more, with the end result being a bracingly sour and acidic beer which is usually mixed with a younger partially fermented lambic to produce a blend called gueuze, or with various fruit flavours (cherry and raspberry being the most common) to create a tart but slightly more palatable refresher.
Further north in the Flemish region of the country, the sibling ale styles Oud Bruin (”Old Brown”) and Flanders Red also wave the sour beer flag, although the sourness is developed using controlled yeast strains and ageing techniques, making the tartness more balanced and not quite as funky or “barnyardy” as that found in lambics. Of the two, Flanders Red tends to be the more sour, with notes of dark fruits and sour berries in both the aroma and flavour, and some vinegar-like notes that can range from mild to strong. Both styles are undoubtedly an acquired taste, but once you get that taste, the Reds in particular can become quite addictive.
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