Then remembered to clean the glass jars and popped them into the oven. It was whilst washing the jars that I remembered the note to myself about the jam being to sweet yesterday, so I dashed outside and picked a bowl of plums, washed and de-stoned them and added them to the strawberries. I am not going to add anymore sugar.
The pan is filling up with froth and yesterday I had read an article by Delia Smith that said not to worry about the scum that rises and that if I keep skimming it off I will end up with no jam. She says to wait until the jam has set, remove from the hear and stir in a small lump of butter, which will disperse the scum. We will see.