If you haven’t already, prepare the elderberry syrup and set 1 cup aside for the purposes of making these gummies.
Line a sheet pan or platter with your gummy molds (*see notes for making without molds).
Add the elderberry syrup to a medium-sized saucepan and bring to a simmer over medium-low heat.
Add the beef gelatin to a small bowl, and ladle in ¼ cup of the hot syrup. Whisk well until the gelatin dissolves.
Add the gelatin mixture into the saucepan and whisk until completely combined.
Heat for about 1 minute, stirring often.
Working quickly, remove from the heat and use a dropper to fill each gummy mold with the syrup mixture.
Once the molds are filled and the elderberry syrup is used up, place the tray of molds into the fridge to chill for 1-2 hours.
After 1-2 hours, check to see if the gummies have set up.
Carefully remove each gummy and place it in a glass jar or airtight container.
Store your gummies in a container or jar for up to 2 weeks in the fridge. Freeze for up to 6 months.