Really nice variation on the Rusty Nail; the Chartreuse brings both an herbal quality and a bite that cuts through some of the sweetness--and it is very sweet. I modified the measurements in line with my preferences for a 4:1 ratio in a Rusty Nail: 2 blended scotch (I used Monkey Shoulder), 1/2 Drambuie, 2 bar spoons Chartreuse. Serving on the rocks is a must.