Make sure all seeds have been removed, the seeds will make the marmalade taste bitter.
If you'd like complete sweetness without any earthy tang, skip adding the peels and just use the kalamansi juice extract.
I prefer to use organic sugar instead of conventional white sugar because US white sugar is processed with animal bones and therefore, is not vegan.
If you have a sweet tooth, increase the amount of sugar from ¾ cup to 1 cup.