1 cup kumquat
1/2 cup brown sugar
2 tsp. lemon juice
Soak and wash Kumquats with ½ teaspoon sea salt in a bowl
Cut each Kumquat in half and then take all seeds out
Blend all Kumquats in a blender until smooth
Pour back Kumquat mixture into a cooking pot. Add half cup of brown sugar, stir around and cook the mixture at medium heat (about 10 minutes)
After 10 minutes, you will see it starts bubbling up, turn the heat down to low and continue cooking for another 15 minutes. Constantly stir the Kumquat mixture during cooking time to avoid burn around the edge and at the bottom
Wait for all sugar melt and blend well with Kumquats, the mixture will get thicker and a bit sticky. At this time add 2 teaspoon of lemon into the mixture to give sour flavor into Kumquat jam (I just add lemon because I find it taste better with sweet and sour flavors, but you can skip this step if you prefer only sweet taste.)
Stir lemon juice and cook for 5 more minutes before turn heat off.
Rinse all jars in hot water, and dry them in an oven at 100 degree
Add Kumquat jam and seal the jars with lids, leave them cool down in room temperature
Store those yummy ready-to-eat Kumquat jam jars in a fridge when done.