I was making onion marmalade as per Debih's recipe. Everything was going fine and it was thickening up nicely.
It was still at the stage where drawing a spoon across the pan had the mix closing back up. Then nature called for a number 1 and I had to go - less than two minutes.
In that time it caught and burnt. That is how quick a disaster can happen.
The lesson? Once the jam is nearly there do not turn your back on it for more than a second.
Good jam making.