I really enjoy a Last Word, but to my own surprise, I have to say that this is markedly better than the Chartreuse version (and much, much better than an equal-parts Chartreuse version). I predict that most of my bottle of Strega will go towards this recipe.
This is really, really yummy. I expect I'll cut back just a tad on the simple syrup next time, but even as written it's hard to go wrong with this combo.