Instructions
Shake, straight up, whatever garnish you feel appropriate.
Notes
Try experimenting with the amount of Creme de Cacao and gin. Some prefer less chocolate. Some might want White Lady-levels of gin (2 parts gin, 1 part each of everything else).
History
I was trying to recall the recipe for the 20th Century and knew it was a corpse reviver 2, minus one ingredient (and the absinthe) and adding Creme de Cacao. I substituted the wrong one, but I like this a lot! It's effectively a white lady with creme de cacao.