Defrost berries in a sieve. Set aside 50 g of beautiful fruit. Put the remaining fruit (do not use the juice) in a high container and puree with a blender.
Add jam sugar and mix for approx. 45 seconds with a blender. Stir in the remaining fruit.
Fill into jars and seal well. Place in the refrigerator or enjoy immediately.
Shelf life in the refrigerator approx. 14 days.