Brouette de Bières

"Fermentation" pictograms

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  Bottom fermentation

  Fermented at a temperature between 39°F and 54°F, bottom fermented beers are usually less fruity and have a lower alcohol content than top fermented ones. Moreover, they often contain more carbon dioxide and should be drunk at a lower temperature.
  This type of fermentation spread during the 19th century. It became famous because of a beer brewed in the city of Pilsen in Czech Republic. Since this time, the name of the city has been transmitted to bottom fermented beers that are usually called "Pils".

  Beers list
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  Mixed fermentation

  The fermentation is called "mixed" because two types of micro-organism ferment the beer. On one hand, some yeast identical to the ones used for top fermentation; on the other hand, some bacteria.
  Beers from mixed fermentation can be identified thanks to their sweet and sour taste.

  Beers list
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  Mixed fermentation and fermentation in oak casks

  These beers are fermented a first time by top fermentation yeasts and bacteria.
  Then, they are stored for several months (18 to 24 months) in oak casks. Oak wood, that is air-permeable, enables the action of micro-organisms that develop some fruity flavors in beer.

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  Spontaneous fermentation

  The fermentation is called "spontaneous" because the brewer doesn't add any yeast. Beer is stored in the open air and yeasts from the environment naturally ferment the beer. These yeasts only live in the Senne valley and Payottenland, consequently these country beers are brewed only in the area around Brussels.
  Beers brewed this way, that can be identified thanks to their acid taste, are called "lambic".

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  Top fermentation

  Fermented at a temperature between 59°F and 79°F, top fermented beers are famous because of their more complex flavours. Moreover, they often have a higher alcohol content (depending on the malt quantity) than bottom fermented ones.
  This fermentation type was originally the most spread one, but since this time bottom fermented beers have flooded the market. Mainly brewed by artisanal breweries, top fermented beers are the ones prefered by beer lovers.

  Beers list