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Lambic is a type of beer traditionally brewed in the Pajottenland region of Belgium (southwest of Brussels) and in Brussels itself at the Cantillon Brewery and museum. Lambic is now mainly consumed after refermentation, resulting in derived beers such as Gueuze or Kriek lambic.
Unlike conventional beers, which are fermented by carefully cultivated strains of brewer's yeasts, lambic is produced by spontaneous fermentation: it is exposed to the wild yeasts and bacteria that are said to be native to the Zenne valley, in which Brussels lies. It is this unusual process which gives the beer its distinctive flavour: dry, vinous, and cidery, usually with a sour aftertaste.
Today the beer is generally brewed from a grist containing approximately 70% barley malt and 30% unmalted wheat. When the wort has cooled, it is left exposed to the open air so that fermentation may occur spontaneously. While this exposure is a critical feature of the style, many of the key yeasts and bacteria are now understood to reside within the brewery and its (usually timber) fermenting vessels in numbers far greater than any delivered by the breeze. Over eighty microorganisms have been identified in lambic beer, the most significant being Brettanomyces bruxellensis. The process is generally only possible between October and May as in the summer months there are too many unfavourable organisms in the air that could spoil the beer.
Since at least the 11th century and probably earlier, hops have been used in beer for their natural preservative qualities as well as for the pleasant bitterness, flavor, and aroma they impart. Today it is the latter that is the reason for their inclusion in almost all beer styles other than lambic. Since the method of inoculation and long fermentation time of lambic beers increases the risk of spoilage, lambic brewers still use large numbers of hops for their antibacterial properties. To avoid making the beer extremely bitter, however, aged, dry hops (which have lost much of their bitterness) are used. Consequently, lambics often have a strong, cheese-like, "old hop" aroma, in contrast to the resiny, herbal, earthy hop bitterness found in other styles. Because of the lower bitterness the traditional favorite hop used for Lambic in the nineteenth century was a variety called Coigneau which was cultivated in the Aalst-Asse area in Belgium.
After the fermentation process starts, the lambic is siphoned into old port or sherry barrels (of chestnut or oak) from Portugal or Spain (some of the brewers prefer used wine barrels.) The lambic is left to ferment and mature for one to two or even three years. It forms a "velo de flor" of yeast that gives some protection from oxidation, in a similar way to vin jaune and sherry; the barrels are not topped up.
Another important feature of lambic is that it is usually a blend of at least two different beers; many "producers" are in fact blenders who buy beers from other brewers, and blend two or more together to create the desired result. A good gueuze, for example, may have occupied space in several different cellars over 6 years or more. The locals are justifiably proud of their unique beer, and recent years have seen an explosion of interest around the world for this unusual beverage despite — or perhaps because of — its complex process of production. While those outside of the area are most likely to find the bottled gueuze and fruit versions, there are a wide variety of styles available to the local drinker, and they are often blended again or sweetened with sugar or flavored syrups before drinking, as some examples can be extremely tart.
Lambic beer is widely consumed in Brussels and environs, and frequently featured as an ingredient in Belgian cuisine.
Most, if not all varieties listed below have Traditional Speciality Guaranteed (TSG) status.
Unblended lambic is a cloudy, uncarbonated, bracingly sour beverage available on tap in only a few locations. Generally three years old. Bottled offerings from Cantillon and De Cam can be found outside of Belgium.
A mixture of young (one-year-old) and old (two- and three-year-old) lambics that have been bottled. It undergoes secondary fermentation, producing carbon dioxide, because the young lambics are not yet fully fermented. It keeps in the bottle; a good gueuze will be given a year to referment in the bottle, but can be kept for 10–20 years. Gose, a German top-fermenting style, is not to be confused with gueuze.
Mars traditionally referred to a weaker beer made from the second runnings of a lambic brewing. It is no longer commercially produced. In the 1990s, the Boon brewery made a modern Mars beer called Lembeek's 2% (the 2% referring to the alcohol content), but its production has since been discontinued.
Historically, a low-alcohol, sweetened beer made from a blend of lambic and a much lighter, freshly brewed beer (called meertsbier, not necessarily a lambic) to which brown sugar (or sometimes caramel or molasses) was added. Sometimes herbs were added as well. The use of the lighter beer (or even water) and of substandard lambic in the blend made this a cheap, light, sweet beer for everyday use. The 19th century French poet Charles Baudelaire commented on Faro's (to him) disagreeable aftertaste, "It's beer that you drink twice", believing that the Faro in Brussels was brewed from the waters of a river (the Senne or Zenne) that was also used as a sewer.
The sugar was originally added shortly before serving, and therefore did not add carbonation or alcohol to the beverage (because the sugar did not have the time to ferment). Modern faro beer is still characterized by the use of brown sugar and lambic, but is not necessarily a light beer. The use of meertsbier has disappeared, and modern faro is not viewed as cheap or light. Modern faro is bottled, sweetened and pasteurized to prevent refermentation in the bottle. Examples are produced by Cantillon, Boon, Lindemans or Mort Subite.
Lambic refermented in the presence of sour cherries (morello cherry) and with secondary fermentation in the bottle results in kriek. Traditional versions of kriek are dry and sour, just as traditional Gueuze.
Lambic with the addition of raspberry (framboise), peach (pêche), blackcurrant (cassis), grape (druif), or strawberry (aardbei), as either whole fruit or syrup. Other, rarer fruit lambic flavorings include apple (pomme), banana (banane), pineapple (ananas), apricot (abricotier), plum (prunier), cloudberry (plaquebière), lemon (citron), and blueberry (bleuet). Fruit lambics are usually bottled with secondary fermentation. Although fruit lambics are among the most famous Belgian fruit beers, the use of names such as kriek, framboise or frambozen, cassis, etc. does not necessarily imply that the beer is made from lambic. The fruit beers produced by the Liefmans brewery, for example, actually use a brown ale (Oud Bruin), rather than a lambic as a base. Many of the non-traditional fruit beers derived from lambic that were commercialized in the last decades are considered to be low quality products by many beer enthusiasts. These products are typically artificially sweetened and based on syrups instead of fresh fruit, resulting in a taste experience that is quite remote from the traditional products.
The name "lambic" entered English via French, but comes from the Dutch language. Lambic is probably derived from the name "Lembeek", referring to the municipality of Lembeek near Halle, close to Brussels.