Wash the plums, cut in half, remove the pits and place in a roasting pan or casserole.
Sprinkle the plums with the sugar and leave to infuse for a few hours, preferably overnight.
Add the spices and bring the mixture to boil. Cook over a low heat for approx. 2 hours to create a nice thick purée. Stir from time to time.
If necessary, finely puree the plum puree in a blender or hand blender. Skip this step if you want your plum puree to be chunky.
Fill the plum jam into clean jars and close tightly with the screw cap.
Oven method
See stove top method step 1
See stove top method step 2
Add the spices and mix everything well. Then place the roasting tin in the oven (middle shelf) and cook at 160°C for approx. 2 to 3 hours until the mixture thickens. Stir every half hour. The oven door should be left ajar to allow the steam to escape (insert a wooden spoon into the oven door).
See stove top method step 4
See stove top method step 5
Notes
Your plum jam will keep for 1 to 2 years in a vacuumed and unopened jar. Once opened, you should keep it in the fridge and use up quickly.