Why opt for shop bought jam when you can make your own?!
Place the apple, the juice of half a lemon, one tablespoon of sugar and 625ml of water into a large pan over a medium heat. Bring to a boil, cook for 20 minutes or until the apples are soft. Mash the mixture and pass through a sieve into a bowl.
Return to the pan over a low heat, heat for 10 minutes, stir occasionally until the mixture has slightly reduced and thickened then leave to cool. Place a saucer in the freezer.
Place the berries in a saucepan, add the remaining sugar and stir. Leave to stand for 15 minutes, add the cinnamon and lemon juice a long with the apple puree. Heat while stirring occasionally for 45 minutes or until the berries are soft.
Reduce the heat, until the temperature reaches 104C, remove the plate from the freezer and drop 1 teaspoon of jam onto it. Let it set for 30 seconds then tilt slightly. If the jam slides down slowly it's ready. If not, cook for a little longer and test again. Remove the cinnamon.