The Bols Genever recipe dates back to at least 1820. However, Lucas Bols— the man behind the Genever— first made genever in 1664. Bols is one of the longest lasting extant spirits brands, period.
Bols Genever is distilled from a malt wine grain base composed of wheat, rye and corn that were fermented alongside juniper berries. 22(!) botanicals are present in total. It is is then rested in oak for a minimum of eighteen months before bottling.