Cover cookie sheets or another level drying surface with clear plastic wrap.
For a stable surface, tape plastic wrap down. Pour puree on surface and spread to 1/8 inch thickness. You can also use 1/3 cup portions and spread in uniform circles.
Stretch a piece of cheesecloth or lay a window screen over but not on the surface of fruit to keep clean.Dry in full sunlight 6 to 12 hours. If not dry after first day, bring inside overnight before returning outside the next day.
To dry in oven, preheat oven to lowest temperature setting, turn off and set fruit purees in middle of oven. You may need to reheat occasionally to maintain warmth. Be sure to open oven door every few hours to let moisture escape. Takes 1 to 2 days to dry.