1. Mix together the blackberries, bluberries, lemon juice and agave or maple syrup (to taste).
2. Divide the berry mix in the bottom of the mason jars and refrigerate for 30mins.
3. Whisk together the remaining ingredients in a mixing bowl.
4. Spoon on top of the berry mix in the mason jar
5. Close the lids and refrigerate for at least 4 hours but preferably overnight before serving.