Heat ingredients on medium-high and bring to a medium boil. Simmer uncovered for about 20 minutes, stirring occasionally. Lower temperature as necessary to avoid overcooking. The kumquats naturally contain pectin, so the liquid with thicken and gel.
4 Continue to simmer until the mixture thickens and holds onto the spatula slightly. Take the mixture off the heat. It will continue to thicken.
5 Place into jars. It will keep in the fridge for a couple of weeks. You can also make extra and freeze it.

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