Located in Bierghes (Rebecq), in the Senne Valley, the Gueuzerie Tilquin is the only gueuzerie in Wallonia. A gueuzerie, or Geuzestekerij in Dutch, is a company that blends Gueuze in the old-fashioned way (or Oude Geuze ).
The freshly brewed musts are purchased from various producers in the region (Pajottenland and Brussels) and placed in oak barrels for fermentation and maturation for 1, 2 or 3 years. The lambics obtained are blended and bottled to give, after 6 months of refermentation, the Gueuze Tilquin à l’ancienne, which is 7.0% alc/vol and is sold in 37.5 and 75cl bottles.