We used this on waffles and pancakes - yum!  I didn't add as much sugar since some of our friends are diabetic, but we did add some sugar substitue to one small batch. 

I always make small batches of this because blackberries are not easy to find and they are very expensive. 

Make and store in fridge for a while and then what you don't use up (on cheesecakes, pancakes, etc.,) put into a plastic bag and freeze.  Nice treat for winter! 

https://www.allrecipes.com/recipe/223332/blackberry-jam/