Halve the kumquat. Place the sieving bowl over a bigger bowl, and squeeze the seeds to deseed the fruit. We need to collect the seeds as they contain the pectin to set the jam. Make a bouquet garnet of the seeds.
Snip the peels with scissors into strips. {I got lazy and gave them a quick spin in the Thermomix}.
Place the cut peels, with the pouch of seeds and any collected kumquat juice, in a heavy bottom pan on full heat. Boil for a few minutes till the peel is tender, stirring constantly.
Add the water and continue to cook on high for 2-3 minutes. Now add sugar, stirring constantly.
Continue to cook over high heat for a further 20-25 minutes until the mixture thickens & the strips becomes translucent. Stir often else it'll catch the bottom. Don't leave unattended.
Do a plate test by dropping some marmalade on a cold metal plate to check if the jam is setting properly. After 30 seconds, it should congeal and look jellylike.
Put off the flame, discard the muslin pouch with the seeds and allow the jam to cool for 10-15 minutes. Stir to distribute the strips.
Now pour the marmalade into the jars, and seal after 10-15 minutes. {I refrigerate my jars}