I've just made plum jam! I used half of my first batch of plums (1kg) just in case it didn't work, but all seems fine. It set nicely and has formed a seal on the recycled glass jars (the poppers on the top are all depressed). The jam is a beautiful plum-red colour (even though the flesh was green) and best of all the bit I put on a plate to test tasted very yummy.
The recipe was simple: 900g plums (before being stoned), 300ml water, 850kg sugar. Cooking in a wide pan until it reaches 220 degrees F or for about 20 mins on a rolling boil. Test a sample on a cold plate, if it wrinkles when you push it then it will set. Pour into hot sterilised jars.
I'm going to have a go at a plum chutney tomorrow and a plum cake on Sunday. the challenge of course is what to do with the next kilo I pick!