I have had terrible trouble posting this! Anyhow.......
The best blackberry jam I have ever had was when I was at university. My flatemate's mother sent the best tuck boxes, and the best thing in them was her blackberry jam. It had apple in it, was very sweet and very soft set. There was something intensely blackberryish about that soft set jam dribbling over the edge of a lovely piece of bread, it reminded be of eating blackberries on a hot day and the way the juice bursts into you hands and mouth. Gosh it was good. I am still good friends with the girl who I shared a flat with, and I still angle for invitations when she goes to visit her parents....just so I can get some of that amazing jam.
Other blackberry jams have never compared and I am a little scared to make my own, even though I love jam making, as I know it won't compare, but the memory of that jam is something I really treasure, one of the culinary events of my life!