The recipes I saw were to use only the peel.
Just a word about quinine:
I have taken it for malaria, which is stronger than taking it as a malaria prophylaxis. When treating malaria, the instructions were to take the dosage at 8 hour intervals. That meant, many times, getting up to take it. I also found it made me throw-up. Therefore, I had to take an anti-nausea med 30 minutes before taking the quinine. Further, it made me dizzy. I would lay on the floor and hope I don’t fall off. I would hear things and all the items in my vision would be disconnected from everything else. I would see what was there. They just sort of were only there.