Wash the plums, cut into quarters, then remove the stones
Split the vanilla pod and scrape the seeds from the middle
Put the sugar into a large pot with 225ml water, the cinnamon and vanilla. Gently heat until the sugar dissolves.
Slide the fruit into the syrup. Bring the pot to the boil, then let it simmer for 5-10 mins – depending on the ripeness – until the plums are soft
Leave to cool slightly and serve as they are -or with something delicious such as cream or creamy yogurt