Wash, halve and stone the fruit and put into the preserving-pan with the water.
If desired, crack a few of the stones, remove the kernels and blanch them by dipping in boiling water.
Add the halved kernels to the pan.
Simmer till tender and the contents of the pan are reduced.
Add the sugar and stir over a low heat till dissolved.
Bring to the boil and boll rapidly until setting point it reached.
Skim, pot and cover.