Peel fruit (red) off seeds (green). Cut up fruit if you like.
Just cover seeds with water, bring to the boil, simmer a few minutes, then allow to stand at least 30 mins. Strain and keep liquid.
Weigh fruit and allow 1.5kg sugar for each 1.5kg of fruit.
Boil fruit and liquid together for 1/2 hour stirring well. Add white sugar and boil another 20-30 minutes.
Bottle into clean/sterilized jars. To check if jam is setting enough, place a saucer in fridge till cold and drop a drop of jam onto cold saucer. It is ready when it does not run any more and wrinkles when you push it.