Add plums, sugar, lemon & zest and water to the slow cooker.
3hrs on high with the lid on, stirring occasionally; 1hr on low, lid off stirring occasionally.
Blend (I like it smooth and thick v's chunky).
Jamsetta is optional, makes it set thicker. I got a cup, used half of the jamsetta pack & some of the pured fruit to mix and added it in. Bottled it up and done!