Arrange the orange slices in a single layer on your dehydrator trays.
Dehydrate at 125ºF (52ºC) until the oranges are dry (see note 1). Depending on your machine, you may need to rotate the trays every so often to promote even drying.
Orange slices will snap when bent once they are completely dried and cooled, and will have no juice left (tear one in half and squeeze—if moisture appears, dry them longer). Take a few pieces out of the dehydrator and let them cool before testing.
Storage Tips
Let the orange slices cool completely before transferring them to an airtight contaier for storage (see note 2).
Notes
Note 1: Oranges can take a long time to dehydrate. The time will vary greatly depending on the thickness of the slices, the humidity levels in your house, the size of your batch, and the machine you use. In our experience, we've had batches that take a few hours, and some that have taken 36+ hours. The best thing to do is to rely on the feel of the orange slices (see instruction #3) instead of total time to determine when they are done.Note 2: Dried orange slices can last 1+ years if properly dried and stored. For long-term storage like this, it's recommended to condition them first.To Condition: Loosely pack the oranges in a transparent airtight container. Check it daily for a week for signs of moisture or condensation, and shake it to help prevent the slices from sticking together. If signs of moisture appear, stick them back into the dehydrator (as long as there’s no mold—in that case, toss the batch). After a week, if there are no signs of moisture or mold, you can package them for long-term storage.