Wash and clean the strawberries and cut them into large pieces. Mix strawberry pieces of currant juice and jam sugar in a large pot. Cover with foil and chill overnight.
Bring the strawberry mixture to the boil in the pot and let it simmer for 2-3 minutes while stirring. Stir in lemon juice and vanilla pulp. Puree the strawberries into pieces with a chopping stick for about 30 seconds. Immediately pour into clean glasses with airtight screw cap. Close the lid tightly. Turn glasses upside down and let the jam cool down.