Wash and Prepare the Citrus:
Scrub the oranges and lemon clean to remove any dirt or pesticides.
Halve the fruit and remove the seeds. Save the seeds in a small cheesecloth bag containing natural pectin that helps the marmalade set.
Thinly slice the peels of the oranges and lemon. The thinner you slice, the more delicate the texture.
Boil the Fruit:
Place the sliced peels, pulp, and the bag of seeds into a large pot.
Add 4 cups of water.
Bring it to a boil, then lower the heat and let it simmer for 1-2 hours. The goal is to soften the peels completely.
Add Sugar and Simmer:
Remove the cheesecloth bag with the seeds.
Add the vegan cane sugar to the pot, stirring until it dissolves.
Boil the mixture over medium heat, stirring occasionally, until it reaches the setting point (about 220°F or 104°C). This usually takes about 30-45 minutes.