Puree the fresh fruit with the lemon juice in a blender or food processor until very smooth. If using applesauce, mix together the applesauce and lemon juice in a mixing bowl. Invert a cookie sheet and cover the flat surface with heat-resistant plastic wrap. Tape the wrap to the cookie sheet with masking tape. (This prevents the edges from pulling up while the fruit is drying) Pour the fruit puree onto the plastic wrap and spread about 1/4 inch thick. Place the cookie sheet in a 140 degree oven, with the oven door open at least 2 inches. Allow the puree to dry in the oven for about 3 hours, or until leathery, but still pliable. Cut into strips and roll up! Store the roll-ups in an airtight container.