Traditionally made with equal parts gin, Green Chartreuse, maraschino liqueur, and lime juice but, like like many others, (when using a 40%-43% alc./vol...
I safeguard my bottle of green Chartreuse as well. I’ve found Luxardo Del Santo with a few drops of Vegetal de la Grande Chartreuse to be a closer substitute for green than Genepy. I use Genepy as a sub for yellow Chartreuse, also with a few drops of Vegetal. In any case, must have my sub because the Last Word is always in my rotation.