Chop the plums, removing the pit, and grate the apple.
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{{/ items}} {{^ items}} {{/ items}}Add the fruit to a deep saucepan along with water, lemon juice, cinnamon, and ginger. Then, simmer for 30 minutes while stirring.
Cook for a further 45 minutes until glossy. Then, blend to a smooth jam before ladling into sterilised jars.