01 - Pour 1/2 cup of the fruit juice into a medium saucepan. Sprinkle the gelatin powder evenly over the surface and let it rest for 5 minutes until the mixture thickens slightly and the gelatin absorbs the liquid.
02 - Place the saucepan over low heat and stir constantly until the gelatin dissolves completely. Do not allow the mixture to boil, as high heat can weaken the gelling power.
03 - Remove the saucepan from heat. Pour in the remaining fruit juice, collagen peptides, honey or maple syrup if using, and lemon juice. Whisk thoroughly until the collagen is fully dissolved and the liquid is smooth and uniform.
04 - If using diced fresh fruit, gently fold the pieces into the mixture until evenly distributed.
05 - Transfer the mixture into silicone molds or pour it into an 8x8-inch baking dish lined with parchment paper.
06 - Refrigerate for at least 2 hours or until the jellies are fully firm and hold their shape.
07 - If using a baking dish, cut the set jelly into uniform cubes. Pop individual jellies out of silicone molds and serve immediately.