For the blackberry chocolate jam, first mix the washed blackberries with sugar and vanilla pulp and leave to infuse for about 2 hours.
Then slowly bring to a boil and stir in the chocolate. Let the mixture simmer for about 5-10 minutes, then puree or mash it and add some more rum to taste.
Pour the blackberry-chocolate jam into boiled (sterilized) jars and let cool upside down or burn off with alcohol.