Oude Quetsche Tilquin avec Prunes de Namur. Beer of spontaneous fermentation, the Oude Quetsche Tilquin à l’Ancienne avec Prunes de Namur is made from the fermentation of a minimum of 250 gr of Prunes de Namur by liter of lambic. Unfiltered and unpasteurized, this beer is refermented in the bottle. Ingredients : water, malt, wheat, hops, purple plums.