Plum, blackberry and apple jam

This is a jam I invented on Friday: plum, blackberry and apple. I had a glut of plums that desperately needed to be used up and a small amount of blackberries to which I added a few more I found growing in the hedge beside the path leading to the allotment. The apples were added to provide pectin.

My recipe was 1.6kg plums, 1.4kg blackberries, 1kg apple. Peel, core and chop the apples. Stone and chop the plums. Ass all the fruit to the preserving pan with a small amount of water to stop it catching on. Bring to the boil and then simmer until all the fruit has pulped. Then add 4kg sugar (same weight as fruit), bring back to the boil and keep on a rolling boil until setting point is reached. Then add to hot, sterilised jars.