Dulce de ciruela (plum jam)

Instructions

1. Wash the plums, remove the stones and cut them into quarters.
2. In a saucepan, put the plums with the water and lemon juice, then cook over low heat for 10 minutes to soften them.
3. Add the sugar and the cinnamon stick, then stir until dissolved.
4. Simmer gently for about 25 minutes, stirring regularly, until thick.
5. Remove the cinnamon stick, then blend if you want a smooth texture.
6. Pour into sterilized jars while still warm and let cool.