That’s the best question! Whenever we buy oranges, we save some of the peels in the freezer. Just wash the peel lightly so that it doesn’t lose its zest but is clean. Then put it in an airtight container and freeze. Whenever you need to use the peel, take it out of the freezer about an hour before use. This peel lasts for months and is perfect when you need orange peel out of season.