Candied orange peels. The Shamouti oranges from our tree are almost as much rind as they are pulp. They are no much good for juice, though are great for eating. The tick rinds
makes lovely biteable candies.
My favorite is chocolate covered peels, but I don't think I have the patience to temper chocolate right now.
I've thrown some mandarin peels in there as well - let's say I'm lucky they didn't flavor the oranges, their peels are no good (though they do make the best juice, in a small chilled glass, it's almost like drinking a shot of liquor, so sharp, acidic and sweet that it burns in the throat).