Blend fruit until completely smooth, adding lemon juice, sweetener, salt, and optional thickener. Continue blending 30-60 seconds until no chunks remain. Strain if using seeded berries.
2 cups fruit puree, 1 tablespoon lemon juice, 2 tablespoons sweetener, 1 teaspoon pectin or gelatin, 1 pinch salt
Line a 13x18-inch rimmed baking sheet with parchment paper, smoothing out wrinkles to avoid uneven drying.
Pour the puree onto the parchment and spread evenly to about ⅛ inch thick using an offset spatula, ensuring uniform thickness across edges and center.
2 cups fruit puree
Dry in an oven or food dehydrator set to 135-140°F for 4-6 hours. If using an oven, prop the door slightly open with a wooden spoon and rotate the pan halfway through drying time.
Check after 4 hours by peeling a corner; leather should lift cleanly with a tacky center, not wet or brittle. If not done, continue drying checking every 30 minutes. Once done, cool 30 minutes.
Roll the cooled fruit leather with the parchment, then cut into 1-inch strips for convenient snack rolls.