01 - Pour the fruit juice and lemon juice into a small saucepan. Sprinkle the powdered gelatin evenly over the surface and let it bloom for 3 to 5 minutes.
02 - Place the saucepan over low heat and stir gently until the gelatin is completely dissolved. Do not allow the mixture to boil.
03 - Remove from heat. Stir in the collagen peptides powder, honey or maple syrup, and vanilla extract until fully incorporated and smooth.
04 - Taste the mixture and adjust the sweetness level as desired before pouring.
05 - Pour the liquid into silicone jelly molds or a parchment-lined, lightly oiled square baking dish.
06 - Arrange sliced fresh berries or a sprinkle of citrus zest into each mold if desired.
07 - Refrigerate for at least 2 hours or until the jellies are fully set and firm.
08 - Carefully remove the jellies from the silicone molds. If using a baking dish, cut into even squares. Serve chilled.