01 - Preheat oven to 170°F or set dehydrator to 135°F. Line rimmed baking sheet with parchment paper or silicone mat.
02 - Combine fruit, sweetener if using, and lemon juice in blender or food processor. Blend until completely smooth.
03 - Pour fruit puree onto prepared baking sheet. Use spatula to spread into even layer about 1/8-inch thick.
04 - Place baking sheet in oven or dehydrator. Dry for 4-6 hours until puree is no longer sticky and peels away easily from liner.
05 - Remove from oven and cool completely. Peel fruit leather from liner and transfer to cutting board. Cut into strips using sharp knife or scissors.
06 - Roll each strip in parchment paper to prevent sticking. Store in airtight container at room temperature for up to 1 week.