Puree the berries. Combine with sugar and just heat through on the stovetop. Strain through cheesecloth to remove seeds. Dehydrate in a dehydrator or in oven. To dry in an oven just set temp at lowest possible setting --about 140ºF degrees would be good. Dry until fruit feels leather like; yet pliable. This would probably best be done on parchment paper, Remove the leather while it is still warm and roll it up.