I used 3 pounds of blueberries, 3 pounds of sugar, the cider vinegar, the lemon juice and the spices and the pectin. It seemed to cook up fine yet when I checked the sample,it’s not set right. A tablespoon of jam slides down the plate when it is tilted. I will let it set longer and try again. I may want to cook it again with more sugar to see if it will improve.
The pint of blueberries are from New York state. They are cute enough to be cooked in a pie! Look around for the farmer's market in your towns. Buy local and eat well!