Edit: like fruit, I'm a fan of using the real thing and after its kegged and carbed, supplementing the natural flavors with extracts to taste. It doesn't take much and the combination of the two, imho, is better than one alone.
__________________ On Tap: Birch Beer, Millerbräu, Sunshine Daydream clone, Pumpkin Stout Aging: pale sour solera, yeast bay lambic, dregs lambic
So I ended up using a SLAP CHOP! to chop the nuts pretty finely and then put them back in the remnant vodka mixture and then added to a muslin bag and into the secondary it went. Then I racked the porter on top of it. We'll see what I have in another week or so, but the vodka mixture tasted awesomely like pistachio and smelled great and the porter was pretty alright too (maybe not as much malt as i'd like coming through).