I recently listened to the Can You Brew It - Ommegang Rare Vos podcast. Rare Vos is a commercial, Belgian Amber beer which uses grains of paradise. Their clone recipe uses over 8g of gop, http://www.homebrewtalk.com/f12/can-...re-vos-307934/
. If i recall the podcast, they steep the grains at flameout while whirlpooling.
I've personally not brewed with it and the amount will vary depending on your recipe and style of beer. Good luck, let us know your results.