In a small saucepan, heat the serviceberries, maple and salt. When the berries are hot and bubbling, puree the mixture with a handblender or in the bowl of a blender.
If using a highspeed blender like a vitamix, make sure not to puree the mixture so hard that it purees the seeds.
You should have a thick puree.
Spread the mixture on a silpat or nonstick baking sheet, or even wax paper, then dehydrate at 135 (fruit setting) for about 8-9 hours, or until the leather is dried, but still slightly pliable.
There should be visible chunks of seeds in the leather, which add a great texture.
Notes
The original recipe is all serviceberries, but if you only have a few, you can mix serviceberries with other fruit and it will still be very good.