Ladle into jars
Remove the jam from the heat and skim off any scum. Stir in a knob of butter, then leave to stand for 15 mins. Ladle the jam into the sterilised jars and seal tightly with the lids.
Calories 40 (2%), sugar 10.3g (11%), fat 0.1g (0%), saturates 0.1g (1%), salt 0g (0%) per serving.