The recipe is French and pretty tasty. Here it comes.
First, get your ingredients together on your kitchen table or worktop.
These are the ingredients:
Ingredients:
1.2 kilo apples
1 kilo sugar
1 sachet of pectin powder ( 8 grammes) - ( brand Tate and Lyle or other make ).
1 packet of vanilla sugar
2 teaspoons of ground cinnamon
1 Big bowl of water with the juice of 1 lemon squeezed into it.
4 clean jam pots with screw-on lids
1 Big pan ( so the jam can boil but cannot boil over )
1 Wooden spoon.
Scales.
Oventray.

Step 1: Prepare Your Apples.

Quarter the apples, peel and core them, then chuck every apple quarter into the bowl with water and lemon juice.
This will keep the apples white/ green/ yellow (so they don't get brown and horrible ).
Once you have cored and peeled and quatered all the apples , stage 2 is getting all the apple quarters thinly sliced, then in thinly cubed.Think 1 x 1 mm !

Step 2: All Your Ingredients in the Pan

Chuck the tiny cubes all in the big pan, add the sugar, the sachet of pectin ( don't breathe in, it will make you cough ) the vanilla sugar, and the cinnamon.
Stir the whole thing through- ( this can be a bit heavy going ) till you have a thick gloop.

Step 3: Cook Your Jam

Put it on a medium heat and cook for at least half an hour, stir with the wooden spoon. Don't go and do something else and leave it bubbling away.
Test if the apple is "done " ( = soft )- this can take quite a bit of time.( so say make it at least 40 minutes).

Step 4: Prepare Your Jam Pots

Let the pots you intend to use for your jam, run through a dishwasher cycle, till they are clean and warm, or clean them with boiling water.
In the meantime - put your oven on 150-180 degrees Centigrade .Boil a kettle with water.

Step 5: Fill Your Pots and Get Them Vacuum Sealed

Spoon the apple jam into your jars.Screw the lids on the jars, put all the jars in an oven tray in the now warmed up oven.Fill the tray with the jam-jars up to 2 centimeters with the boiling water.
Close the oven and let warm up for 5 or so minutes. Then let the jam-jars completely cool down in the oven.
This seems to help with getting the pots to not spoil and the jam be OK.
You're done! From apple tree to apple jam in just a few easy steps!!
Enjoy your homemade apple jam.It's especially delicious with warm croissants .