My mix was 1.5/.5/.5 (Like green chartreuse and dry vermouth) with .3 water. Next time I’ll skip the water as the ice melts enough. A very nice drink for a “puritan”.
I love Chartreuse. When tasted it neat, it has you think "Naah, flavours are too strong, it will spoil any cocktail". But then, once mixed, it becomes extremely gentle. I definitely recommend this "improved" Martini recipe.