I give up, I'm not making jam again!
Week before last I made strawberry jam, followed the recipe, fresh picked strawbs, jam sugar as they are low in pectin!!!! Would it set??? NOPE! So cheated in the end and helped it along with a strawberry jelly!!!!
Now, I've spent a week picking my first decent crop of blackcurrants, got almost 4lb, got preserving sugar as morrisons didn't have any other, but thought that would be okay as blackcurrants are supposed to be high in pectin, and some recipes even use just ordinary granulated sugar!
Followed the recipe, kept trying it for a set, nothing, another little boil, another little test!!!! Nope!
But last year, my strawberry jam was if anything TOO set, you had to cut it with a knife, but used the same recipe (I think!!)