We went out blackberrying on the weekend and came home with several container loads (probably about 17-18 L approx) so we had a good harvest! Last night I made some jam which set very well. The recipe I used was:
1.8kg fruit 1.8kg sugar 4 Tbsp lemon juice Rind and pith/pips of lemon in muslin bag
The jam took about 20 mins to reach setting point and I got 8 jars (about 300mls each).
I've frozen the bulk of the berries for use later on in crumbles, pies, muffins, cakes and ice blocks. Yum!