I always use frozen blueberries, and we love this recipe, from Gourmet Preserves.
1 cup chopped tart green apples (such as granny smith)
1 lemon peeled, seeded and chopped
1 pint frozen fresh blueberries
3 cups sugar
1/2 cup water
Finely chop apples and lemon in food processor. Place all ingredients in
large sauce pan, bring to a boil,
stirring constantly until blueberries thaw and sugar dissolves. Boil gently, uncovered, stirring
occasionally until thickened, about 30 min. Pour into hot sterilized jars. I bwb for 10 min in 1/2 pt
jars-yields about 3 jars.