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Bintani |
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As you know the Belgians have been brewing beer in a multitude of conditions and styles. And they've been doing it for centuries, dating back to at least the 12th century, with increasingly high quality standards.
If we're going to "get technical" about brewing Belgian-style beers, the 3 experts focus on a couple of their favourites: Abbey-style and Farmhouse-style (Saison).
When we refer to Abbey-style today, what exactly do we mean? And how does choosing just the right yeast help create an ideal Abbey-style beer?
Stéphane Meulemans, a General Maanger at Fermentis by Lesaffre, explains that there is a huge range of Belgian Abbey-Style beers, varying in color, alcohol, taste and flavor. The color range is mainly impacted by the use and amount of specialty malts. The alcohol level ranges mainly between 6-10% ABV, depending on the original gravity of the wort and the yeast ability to assimilate the different sugars in the wort. The flavour is basically related to the raw materials used in the brewing process (e.g. malts, hops, etc.) and the yeast used during the primary fermentation.
"Most of the yeasts are from the specie Saccharomyces cerevisiae. There are two families predominantly used for the main fermentation. The first, which can use ferulic acid contained in the malt and convert it into phenols, is classified as POF+ (phenolic off flavor positive) and produces beer with a phenolic quality, characterized by a clove-like or medicinal aroma," says Stéphane.
The other family, which is not able to use ferulic acid, produces more fermentative aromas, higher alcohols and esters compounds. The beers it produces are generally perceived as more fruity. "The choice of yeast strain is critical to define the final profile of the beer. When the yeast does not produce phenols, the expression of fermentative aroma is much more evident. So in this respect, the genetic potential of the yeast instills specific aromas and flavors to the beer," adds Philippe Janssens.
The other principal characteristic of the yeast is related to the assimilation of the sugars in the wort. The higher the assimilation, the higher the attenuation. Generally, brewers use the apparent degree of fermentation as a parameter to define the end of the fermentation. During the fermentation process, fermentable sugars are mainly converted into ethanol, CO2 and aromatic compounds. If the attenuation is high, the production of those volatile compounds are higher as well, due to the yeast.
The SafAle™ BE-256 we suggest for brewing Belgian Abbey Style Beer is POF-, and presents a high degree of attenuation, between 82 - 86%, therefore the level of alcohol and esters produced is very high, resulting in fruitier beers. The other interesting property is that the yeast has a flocculent character that leads to fast sedimentation, helping to clarify the beer at the end fermentation," says Philippe.
The origins and characteristics of Farmhouse-style beers are very different from Abbey-style. How did they evolve? Patrick Zanello explains that Saison-style beers are associated with farmhouse-style beers, which historically, varied widely in taste and aroma, as each farm brewer used their own available ingredients and brewed their own distinctive style. Other features of Saison-style are the presence of phenols, produced by the POF+ yeast strains, and a smooth bitterness with nice balance between the higher alcohols and the esters, with some yeasty notes.
They are relatively pale in appearance, as they are produced with pale malts. A great example of this style is the “Saison Dupont,” famous in Belgium and recognized as a model across borders. " SafAle™ BE-134 does a nice job of helping deliver these Saison characteristics. The specie of this yeast strain is Saccharomyces cerevisiae var. diastaticus, which means the yeast naturally produces certain enzymes, such as the Amyloglucosidase (AMG), that are capable of degrading most of the sugars present during the fermentation. This AMG generates glucose that will be fermented and consequently metabolized into ethanol, CO2 and aromatic compounds. Thus, the apparent degree of fermentation is very high, mostly above 90%," Patrick explains.
According to the literature, all S. cerevisiae var. diastaticus are POF+ and use the ferulic acid present in the malt for the synthesis of the phenols, mainly 4-VG. The other interesting property of the yeast is that flocculation and sedimentation behavior is low, and the yeast remains in the media to complete the fermentation.
As the beers are produced in the spring, the temperature range is average to high. The yeast is robust – it will typically initiate fermentation in the 18-24°C range and the temperature occasionally can freely rise up into the 30°C+ range during fermentation. " I'm a fan of Saison. It is such an aromatic, refreshing beer, with great drinkability and a nice, dry finish. It always leaves you wanting another sip," says Patrick.
Stéphane Meulemans is an entrepreneur whose successful background includes over 15 years working in the hops industry and opening a Belgian craft brewery. He earned degrees in Brewing Engineering and Business Management from Catholic University of Louvain in Belgium. Since 2014, Stéphane Meulemans has been the General Manager at Fermentis, the business unit of Lesaffre in charge of developing and selling fermentation solutions for the beverage industry.
Philippe Janssens holds a Bio-Engineering degree and a Masters in Malting & Brewing Science. He has spent over 30 years in the brewing industry, including being a brewer in Africa and Belgium, and a patent engineer. Now he is the Technical Manager & Brewer at Fermentis.
Patrick Zanello has a Biology degree, majoring in Genetics, from the University of São Paulo. He was head brewer at Colorado Brewery, and managed plants for Schornstein Brewery and Beltway Brewing in the U.S. He is now Regional Sales Manager for Fermentis, responsible for the Brazilian region.
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