01 - Lightly coat a silicone jelly mold or an 8-inch square pan with neutral oil to prevent sticking.
02 - Pour the fruit juice into a medium saucepan. Evenly sprinkle the gelatin and collagen peptides over the surface and allow to bloom for 5 minutes.
03 - Add the fresh lemon juice and honey or maple syrup, stirring gently to incorporate.
04 - Warm the mixture over low heat, stirring constantly, until the gelatin and collagen are fully dissolved. Do not allow the mixture to boil.
05 - Remove from heat. Gently fold in the diced berries and citrus zest for added texture and brightness, if desired.
06 - Pour the mixture into the prepared molds or pan. Refrigerate for at least 2 hours, or until completely firm and set.
07 - If using a pan, loosen the edges and cut into cubes. If using shaped silicone molds, carefully pop each jelly out.
08 - Transfer to an airtight container and store in the refrigerator for up to 1 week.