18 south blueberry jam

Either dice the apple to the same size as the blueberries or grate the apple and add to the mix.  The apples will help the jam to set.

1 pack (1kg) 18 south blueberries

2 large granny smith apples

½ cup lemon juice

1.5kg sugar
Peel and core the apples.  (If grating leave the skin on if desired.)  Add with the blueberries and lemon juice to a heavy-based saucepan.  
Cook gently over a low heat until the fruit is soft and cooked.  
Turn the heat up and bring the mix to a rolling boil.  
Add the sugar gradually, stirring until the sugar is dissolved.
Boil rapidly for 10 minutes, then test for setting.  If necessary boil for another 2-3 minutes, then test again.  
Take off the heat and let settle for a few minutes - remove any scum from the side of the saucepan.
Pour into hot, dry, sterilised jars and seal.
Store in a cool dry cupboard.
Blueberry 1