Drain the pineapple and collect the juice. Cut or chop the pineapple into very small pieces. Select the raspberries, rinse with cold water and drain. Mix fruit, 100 ml pineapple juice, jam sugar and citric acid in a pot. Bring to the boil while stirring and simmer for 3 minutes until bubbly. Pour jam full to the brim into clean, cold-rinsed jam jars and close them tightly