I made a super hoppy IPA with grapefruit, orange, and lime. I used all of the rind from 2 of each fruit, and then I extracted all of the juice & pasteurized it. I added the rind in the middle of the boil and the juice right near the end.
It was f***ing delicious. After about a month or two in bottles it tasted like fresh, resiny, hoppy grapefruit delicious beer. It's a bit past it's prime now (about a year and two or three months later), but it's still great. Also, once I peeled the fruits, I put the rinds on foil and toasted them in a toaster oven for a bit in a drying attempt. It didn't dry them, but it brought the oils out which I'm sure helped once the rind was boiling.
This was the label for it:
