01 - Pour the fruit juice and lemon juice into a small saucepan. Sprinkle the gelatin evenly over the surface and let it bloom for 3 to 5 minutes.
02 - Warm the mixture over low heat, stirring gently until the gelatin is fully dissolved. Do not allow the mixture to boil.
03 - Remove the saucepan from heat. Stir in the collagen peptides powder, honey or maple syrup, and vanilla extract if using, until everything is fully incorporated.
04 - Taste the mixture and adjust sweetness by adding more honey or maple syrup as needed.
05 - Pour the mixture into silicone jelly molds or a parchment-lined, lightly oiled square baking dish.
06 - Press sliced fresh berries or a pinch of citrus zest into each mold if desired for visual appeal and extra flavor.
07 - Refrigerate for at least 2 hours or until the jellies are firm and fully set.
08 - Carefully remove the jellies from the silicone molds. If using a baking dish, cut into squares with a knife. Serve chilled.