Wash glasses with hot water and let them drip off. Sort the raspberries. Wash cherries, remove stalks and stones. Weigh 500 g cherries. Score the vanilla pods lengthwise and scrape out the pulp.
Put raspberries, cherries, jam sugar, vanilla pulp and pods in a large pot. Bring to the boil while stirring over high heat. Boil for at least 3 minutes while stirring continuously. Pour into the prepared glasses with twist-off lids.
Turn over and let it stand on the lid for about 5 minutes.