How to Make Rhubarb Blueberry Jam
- In a large bowl, add the rhubarb and sugar; stir to coat evenly.
- Cover the bowl, and place it in the refrigerator overnight
- The next morning, place the rhubarb mixture in a large kettle.
- Cook over medium heat; stirring constantly, until the mixture starts to boil, then lower the heat just a bit, and cook for 12 minutes (stirring constantly).
- Remove the kettle from the heat, and add the gelatin powder, and keep stirring for 1 minute.
- Add the can of pie filling, and stir thoroughly until mixed through.
- Return the kettle to the stove. Start to cook over medium heat; stirring constantly, until the mixture comes to a boil.
- Remove the kettle from the heat, and carefully ladle the jam into the sterilized glass jars.
- Cover the jars with the lids, then cool the jam to room temperature, before storing the jam in the refrigerator or freezer.