Originally Posted by Andy M.
What do you think this accomplishes?
It is a great way to get jams and chutneys to the right consistency. It helps carmelize them more. If they are left on the heat too long they get burnt. If too short, they dont carmelise enough. So, the on, off, on, off... fixes prevents these problems. It best to let them just cool down, rather than get cold though. Otherwise they are difficult to stirr, and they should be stirred after every heating.