When it comes to drying tomatoes in a food dehydrator, peeling is not strictly necessary. It ultimately depends on your personal preference and the intended use of the dried tomatoes.
If you choose to leave the skins on, you will retain more nutrients, and the drying process can enhance the flavor and texture of the tomatoes. The skins help to maintain the shape of the slices, which can be beneficial in certain recipes. However, some might find the texture of the dried skins less appealing, particularly if the tomatoes are being used for dishes where smoothness is desired.
On the other hand, if you prefer a more refined texture without the skins, you can peel the tomatoes before drying. Peeling might be especially advantageous if you plan to use the dried tomatoes in sauces or dishes where a smoother consistency is preferred. To peel tomatoes easily, you can blanch them in boiling water for about 30 seconds, then plunge them into ice water. The skins will slip off quite easily after this process.
Regardless of your choice, make sure to wash the tomatoes thoroughly before drying. Slicing the tomatoes into even pieces also helps ensure they dry at the same rate. If you are using a food dehydrator, set it to the appropriate temperature (usually around 125°F to 135°F) and check periodically for doneness; dried tomatoes should be leathery and pliable but not brittle.
In summary, whether to peel tomatoes before drying depends on your taste and how you intend to use them later. Both methods are effective, so feel free to experiment and determine which one you prefer!