Genever is basically a blend of whiskey and gin and in this drink combines wonderfully with Scotch as a base to which maraschino and blood orange flavour...
I'm confused by this comment... Is Bols Genever not an oude? It's classified as such here on DG (https://www.diffordsguide.com/beer-wine-spirits/1111/bols-genever) (even with comment history related to it previously being categorized as a jonge before being changed to the oude category...).