Green Walnut Liqueur

Hey there - so this looked like fun. And since the squirrels get all the walnuts exactly 11 seconds after they're ready, I thought it was the only real way to get any of them at all - that is, pick them when they're nice and green and appear to be of no use at all.
http://www.davidlebovitz.com/archives/2009/07/liqueur_de_noix_green_walnut_liq.html

This used a very expensive but ancient bottle of vodka - DL says use the cheap stuff, but it was sunday, liquor stores closed, and based on how long this bottle had been around it wasn't getting used any time soon. It is currently a wild shade of chartreuse. Supposedly drinkable when it turns a coffee brown, and supposedly perfect poured on vanilla ice cream. As with all good things, further research is clearly called for. Will report on the results in due course.