Cut the Kumquats lengthwise and remove any seeds and dry pith. Add to the food processor and pulse until very small.
To a medium saucepan, add all the ingredients. Stir until combined over medium heat. Attach candy thermometer to the pan.
Cook for 20-30 minutes or until the temperature reaches 220° F/104° C on the candy thermometer. Skim any foam that is on the top.
Pour the hot mix into sterilzed jars (see note) and seal. Allow to set for 24-48 hours.
Notes
* If you don't have a candy thermometer, place a small plate in the freezer for an hour before you start. To test if the marmalade is ready, drop a little onto the plate and if it gels, it's ready.** To sterilize the jars, wash with warm soapy water and rinse well. Arrange the jars and lids onto a baking sheet and leave in a preheated, 175 degree F/80 degree C oven for 25 minutes. Or, boil the jars and lids in large saucepan of boiling water for 15 minutes. Allow to dry completely.