Bols Genever Barrel Aged is aged on French oak casks for 18 months. Perfect serve for aged cocktails or to be enjoyed neat. Master Distiller Piet Van Leijenhorst, current secret recipe keeper and steward of Bols Genevers for over 25 years now, was inspired by the American bourbon tradition and decennia of experience in aging Genever by the Lucas Bols Company and decided that an original 19th century Bols Genever recipe would be perfect for aging on oak casks from the French Limousin region. Taste: Rich taste and rounded malty flavour, with vanilla, wood and apricot tones.