Clean and wash the rhubarb. Weigh 750 g and cut into small pieces. Wash and clean the strawberries. Weigh 250 g and halve or quarter them depending on size.
Mix rhubarb and strawberries well in a large pot with the jam sugar. Ca
Leave to stand for 1 hour until all the juice has been drawn
Bring to the boil over a high heat while stirring, allow to boil for 4 minutes while stirring continuously. Remove the cinnamon stick. Pour jam immediately into prepared clean screw-top jars. Close and let cool upside down
Shelf life: 6-9 months