you can use any fresh orange peel, in any beer, at any time addition, and the results are staggering
I have a very experienced brew friend of mine (wins alot of medals, sells his own beer) Who would not try my African Amber clone because of the orange peel add that I had. He said it would make it bitter. After alot of emasculating, and telling him to trust me, he finnally added it to the recipe. This beer has quickly become a favorite in his stable, as he always has 5 beers on tap. He has made this beer 3 times, and added different grains, but always dry hopped it.
What the orange peel does is to almost add another level to your hops. It's crazy, but added in the right amounts.( about 1 orange worth of orange peel, no pith per 5 gallon). After about a month the orange flavor dissapears, and you think it's the hops. For a stronger flavor use tangerine, those are my favorite. What orange you use is not important, this curacao add is good, but it's for wits, and grand crus. I think people get confused thinking this is the only orange you can add. Trust me add it whenever 30min, 10min, flame out. You will be astounded at how refresing this can make your ambers, and pale ales.