Raspberries selected. Wash and drain the cherries and other berries. Stone and remove stalks from cherries. Clean the strawberries. Strip currants from the panicles with a fork. Weigh 1 kg of fruit.
Mix with jam sugar in a large pot. Cover the pot and let the juice stand for 3-4 hours.
Bring to the boil over high heat while stirring. Then boil for at least 4 minutes while stirring continuously.
Stir in lemon juice. Immediately pour the jam into clean twist-off jars, close them and let them cool upside down.