Part of Bersalis Tripel’s production matures at Oud Beersel brewery on wooden barrels alongside the lambic barrels.

Due to the micro-organisms present in the brewery, the beer undergoes a second fermentation, this time a spontaneous fermentation on wooden barrels by Lactobacillus and Brettanomyces.
After a maturation of 16 months on wooden barrels previously containing Chateauneuf du Pape red wine, the first batch of this unique beer was bottled and fermented a third time on bottle.