01 - Pour 1/2 cup of the fruit juice into a medium saucepan. Sprinkle the gelatin powder evenly over the surface and let it sit for 5 minutes until it blooms and becomes slightly thickened.
02 - Place the saucepan over low heat and stir constantly until the gelatin dissolves completely. Do not allow the mixture to come to a boil.
03 - Remove from heat. Stir in the remaining fruit juice, collagen peptides, honey or maple syrup if using, and lemon juice. Whisk vigorously until the collagen is fully dissolved and the mixture is completely smooth.
04 - If using diced fresh fruit, fold the pieces gently into the mixture until evenly distributed.
05 - Pour the liquid into silicone molds or a parchment-lined 8x8-inch baking dish, dividing evenly.
06 - Refrigerate for at least 2 hours or until the jellies are firm and fully set.
07 - Pop the jellies out of the silicone molds. If using a baking dish, cut into uniform cubes. Serve chilled and enjoy.