Quince jelly is real easy!
You don't have to peel or core it (unless you really want to).
Just cut it up into chunks and put it in a pot of water to boil - just as you would for spuds.
When the quince is nice and soft, seive off the water and keep that! Now throw away the quince!!
Or if you did peel and core it you could use the mushy stuff to make a pudding but it's pretty sour and needs quite a lot of sugar. It makes a nice pie, especially mixed with apple.
But back to the jelly.....
Measure the water and add sugar to it - cup for cup.
(If you have 2 cups of juice, add 2 cups of sugar.)
Then just boil it until it will set when you test it, in a saucer.
We have a quince tree and we love it!
Robyn