Place the ingredients in a medium sized saucepan and bring to the boil. Turn down to a low simmer and place a lid on top. Simmer for 10-15 minutes, or until the plums skins have burst and the fruit is soft and pulpy.
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The amount of sugar you need will depend on how sweet the plums are. I’ve gone for a minimal amount here but increase it if the plums are still sour. Add the extra sugar bit by bit, tasting as you go, so that you get the right balance.”