Cranberry Jam

For christmas day dessert I am making Nigella Lawson's cranberry bakewell tart, and the first step of that is to make the cranberry jam. I've never made any kind of jam before, but this recipe is very simple and only took about 15 minutes to make.


4 cups cranberries
1 3/4 cups sugar

Put a film of water in a large pan, add sugar and cranberries and cook over medium heat until the sugar has all dissolved. Turn up the heat and rapidly boil for 7 minutes. Pour the jam into a sterilised jar and seal immediately.