A year ago, I picked and washed some fruit from our Page orange tree, then used a vegetable peeler to obtain thin slices of peel. These I put into a glass jar, which I then filled with plain vodka. That, plus time, produced an awesome orange extract.
It's not something I would drink—I wouldn't drink vodka anyway—but as a flavoring I say it's great, and I have the dark chocolate orange fudge to prove it.
This year's harvest is now mellowing in its vodka marinade, and I'm trying another as well, using peel from the Meyer lemons that were a gift from a friend. (The Meyer lemon, by the way, is a hybrid, 25% pomelo, 25% mandarin, and 50% citron; the Page orange is 25% grapefruit and 75% tangerine.)