First Day: wash slice and seed kumquats* use an equal amount of water by weight to fruit let stand overnight.
2 c water = 1lb of Kumquats
Second Day: boil until tender
Third Day: boil 30 minutes, weigh and add equal amount of sugar.
Boil 30 minutes more
Then bottle in boiling water bath 5 min.
*cook seeds with water for added pectin and add to mixture in last boil
All bitterness is banished. I have adjusted this from time to time and used less sugar.