Wash, halve, stone and finely chop 1.2 kg of plums or damsons and weigh 1 kg of pulp. Chop 50 g dark chocolate (min. 70 %). Put plums and 1 pack (500 g) jam sugar (2 : 1) in a pot and bring to the boil while stirring occasionally. Cook for 3-4 minutes until bubbly. Remove from heat and fold in chocolate. Pour jam into prepared twist-off jars. Seal immediately and let cool off.
Shelf life: 6-9 months