I recently had a Tripel Karmeliet on draught at Monk's Cafe in Philly, and it was one of the best Tripels I think I've ever tasted. There are hints of coriander in the flavor and aroma. It had a mild sweetness but was balanced by the citrus, soice and alcohol. I'd love to clone that beer.
Northern Brewer has an extract clone kit. I converted it to all grain and adjusted the recipe a bit for my system. I have it on tap right now, and it's pretty tasty (I haven't done a side by side yet so I'm not sure how close it is to the real thing).
10.5 lbs Belgian Pils
.75 lbs wheat malt
.75 lbs oat malt (couldn't get this at my LHBS so I used all flaked - next time I'll order online and get the malted oats)
.5 lbs flaked barley
.5 lbs flaked wheat
.5 lbs flaked oats
2 lbs cane sugar
1 oz Styrian Goldings - FWH
.25 oz Saaz - 60 min
.75 oz Saaz - 15 min
.5 oz coriander - flameout
Wyeast 3522 (LHBS was out so I used White Labs 550 instead)
Mash 148 for 90 minutes
Oxygenate 90 seconds, pitch yeast at 63, let rise to low 70's