Slice pears into thin slices (⅛ inch - ¼ inch) with skins still on, discard core. If you're comfortable using a mandolin for slicing this will make a quick go of it. Or some food processors have slicing attachments.
If desired, lemon juice can be mixed with 4 cups of water. Slice pears can be dipped into water to help prevent discoloration. This step is optional.
To Use a Dehydrator
Place on dehydrator trays so the slices are not overlapping.
Dry at 130°-140°F for 8-10 hour until pears are dry and leathery with no moist spots.
To Use an Oven
Place slice pears on a baking sheet lined with parchment paper.
Bake in a preheated 250°F oven for 1 ½ - 2 ½ hours until pears are dried.
Condition Dried Pears
Place dried pears into a container and allow pears to condition for 5-7 days. Conditioning allows the pears with more moisture transfer some of the that moisture to the dryer pears. If condensation appears on the sides of the container, your pears need to dry for a bit longer. Put them back on the dehydrator for 1-2 hours.