Preheat oven to 160°F. Mix lemon juice and 4 cups of water. Soak pear slices for 10 minutes in lemon water, remove and place on paper towels to absorb water. Arrange pear slices on a parchment paper-lined baking sheet in a single layer.

Place pears in the oven for 3 hours and check for desired doneness. When ready, remove pears from the oven and allow them to cool. Put in airtight containers and store.

Dehydrated pears will last 30 days, or longer if frozen.