Beer of spontaneous fermentation, the Oude Reinette Étoilée Tilquin à l'Ancien is made from the fermentation of Reinette Etoilée apples (a local Belgian variety) in a blend of 1, 2 and 3 years old lambics. The final concentration of apples 390g by liter of lambic. Unfiltered and unpasteurized, this beer is refermented in the bottle.