Sort and wash the blackberries. Cook apple juice and blackberries for 5-8 minutes. Hang a fine sieve over a large pot. Pour apple mixture into the sieve and pass it through with a spoon. Results in about 700 ml fruit juice. Leave to cool down a little. Peel, halve and core apples. Dice apples. Weigh 200 g fruit flesh. Add apples and jam sugar to the apple-blackberry juice. Mix everything well. Bring to the boil over high heat while stirring. Then boil for at least 4 minutes stirring continuously until bubbly through and through. Fill jelly immediately into prepared clean twist-off glasses and close them. Let cool upside down
Preparation time approx. 40 minutes
Shelf life 9-12 months