Method

1. 1Step : Wash the plums and pit them.
2. 2Step : Place them in a preserving pan or a large deep skillet, add the jam sugar and the cinnamon stick.
3. 3Step : Mix well, cover with a clean kitchen towel and let macerate for 1 night.
4. 4Step : Cook the fruit gently in the sugar over low heat for 15 to 20 minutes from the boil, until the fruit breaks down and the mixture takes on a syrupy consistency.
5. 5Step : 5 minutes before the end of cooking, add the lemon juice.
6. 6Step : Immediately pour the boiling jam into previously scalded jars, up to 1 cm from the rim, seal them tightly and turn them upside down.