01 - Lightly coat a silicone jelly mold or an 8-inch square pan with a thin layer of neutral oil to prevent sticking.
02 - Pour the fruit juice into a medium saucepan. Evenly sprinkle the gelatin powder and collagen peptides over the surface of the liquid and allow to bloom for 5 minutes undisturbed.
03 - Add the fresh lemon juice and honey or maple syrup to the saucepan. Stir gently until all components are evenly combined.
04 - Place the saucepan over low heat and stir constantly until the gelatin and collagen peptides are fully dissolved. Do not allow the mixture to reach a boil.
05 - Remove the saucepan from heat. If desired, gently fold in the finely diced berries and citrus zest for added texture and brightness.
06 - Transfer the mixture into the prepared molds or pan. Refrigerate for a minimum of 2 hours, or until the jellies are completely set and firm to the touch.
07 - If using a pan, run a knife along the edges to loosen, then cut into uniform cubes. If using shaped silicone molds, carefully invert and release each jelly.
08 - Keep the finished jellies in an airtight container stored in the refrigerator for up to 1 week.