Easy Grape Jam is a classic American preserve, great on it's own but even better paired with peanut butter for that all American taste sensation!
Before you start:
Put 2 - 3 saucers in the freezer.
Sterilise 3 x 0.5 ltr jars by washing in hot soapy water (or take straight from dishwasher), fill with boiling water, empty and then place in oven for 20 minutes at 140°C where you leave them until the jam is ready. Washed lids should be sterilised with boiling water and then left to drain.