Chop up your rhubarb into small pieces and add to a shallow skillet. Top with water just enough to cover and simmer on low-medium for 10 minutes.
Drain the rhubarb. Strain the rhubarb by tying it up in a cheesecloth and pressing all the liquid out.
Add the softened rhubarb to the blender. To the blender, add the strawberries and honey. Blend until a thick puree.
Prepare your food dehydrator by trimming parchment to fit. Spoon your mixture evenly on the parchment.
Place the trays in the dehydrator. Dehydrate for 4-5 hours at 130 degrees F. Towards the 4-hour mark, check to determine if you need more time.
Once done, it should peel off the parchment and be able to bend/roll. If you dehydrate too long, you'll have chips instead of fruit leather. Rip each sheet into 4 smaller pieces.
Store in a gallon-size Ziploc bag.