This drink recipe is very peculiar. Typically, I am very against anyone mixing absinthe; it's a liquor best enjoyed with a little added water and not much more.
But the idea of mixing it with a similar herbal liquor like Zwack isn't so repulsive once I think about it. Of course, I don't quite see the connection between strong anise flavor and a sunny, life-giving phoenix from the Final Fantasy series. However, it really looks pretty [via the Drunken Moogle]:
1/2 shot Absinthe
1/2 shot Zwack
2 tsp. Simple Syrup
1 splash Grenadine
Check out the Drunken Moogle site if you're interested in making this oddly herbal drink.