How to make plum and apple jam

The urgency to create space in our freezers has stepped up a gear so I defrosted 3kg of plums recently and added in 2kg of apples from our stockpile. It made a great jam. The quantity of apples and plums relative to each other can be varied but make sure there is sufficient plum juice in which to simmer the apples. Use the same weight of sugar as weight of fruit.