Or so they say, Harry Craddock from the Savoy decided to add his take
1 Large Measure Irish whiskey(*)
1 tsp Green Chartreuse
1 tsp Green Creme de Menthe
Shake serve with a green olive.
(*)It needs to be irish, it just doesn't work otherwise
This is a surprising drink, in that it works at all, since the design on first glance seems to be use Irish ingredients & make it green. The olive is a bit unnecessary in my opinion, but then I'm not a big a fan of olives. Give it a try you might like it