Temperatures ranging from 170 °F (77 °C) to 200 °F (93 °C) will work. [1] X Research source
The slits should be about 1⁄4 inch (0. 64 cm) deep. You can also place the orange on a cutting board and hold it firmly to make the slits.
Don’t worry if your slices aren’t all equal. The drying process will change the shape of the oranges a little anyway, and mismatched slits can look even more charming and rustic. [3] X Research source Repeat this slicing process for each orange.
Make sure they’re not touching after sliding the sheet into the preheated oven so they don’t stick together. [5] X Research source
If you need to use your oven for something else during this time, it’s okay to take them out for an hour, just remember to let the oven cool to the lowest heat setting before putting them back in. [7] X Research source
Rotating them on occasion will also help them dry more evenly. [9] X Research source
If they feel spongy or sticky, put them back in the oven and check on them in another 4 hours. Don’t worry about over-drying the oranges, so if you’re not sure, leave them in for a little longer. Allow them to cool completely before handling, which will probably take a couple hours.
If you don’t have the manual or are unsure, set the temperature anywhere between 125 °F (52 °C) and 140 °F (60 °C). [12] X Research source
The slits should be about 1⁄4 inch (0. 64 cm) deep. It’s okay to go into the pulp a little, but avoid going too deep. You can also place the orange on a cutting board and hold it firmly to make the slits.
Don’t worry if your slices aren’t all equal. The drying process will change the shape of the oranges a little anyway, and mismatched slits can look even more charming and rustic. [14] X Research source Repeat this slicing process for each orange.
If your dehydrator has sliding trays, double check that the oranges haven’t rolled together after inserting.
If you need to make a few deeper cuts, it’s okay to take them out and put them back in. [17] X Research source
As they dehydrate, you’ll notice slight discoloration or browning of the peel as well as a beautiful citrus smell! Don’t worry about over-drying the oranges, so if you’re not sure, leave them for a little longer.
If they feel spongy or sticky, put them back in and check on them in another 2 to 4 hours. Allow them to cool completely for a couple hours before handling.
