Quite some time ago I did a wheat with cascade and "dry zested" with 2 lemon peels worth of zest (just the very outer zest, no white). It turned out good, the lemon was a good match with cascade. I added the zest to the secondary, but have not used a secondary (or zest) since.
My wife really likes Widmer's Shaddock IPA, It is their X-114 Citra IPA with grapefruit peel added.
I'm going to brew up a an extract hop burst IPA with Amarillo and Simcoe (cause I don't have Citra).
Anyone brewed with grapefruit zest? What would you recommend? I'm just looking for a little aroma and flavor.