Wash and trim ends off of the figs, then slice in half. Place figs in an eight-quart Dutch oven, top with sugar. Add lemon juice, zest, cardamom, and cinnamon (if using).
Cook over low heat, uncovered, allowing the sugar to melt slowly, as you gently stir.
When the mixture begins to boil, lower the temperature and allow the preserves to simmer for 30 to 40 minutes, or until thickened.
Meanwhile, place the jars and lids in a large pot filled with enough water to fully submerge the jars. Boil for approximately ten minutes to sterilize.
Carefully pour the preserves into the steralized jars, leaving a ¼" headspace. Wipe off the lids and sides of the jars, then seal tightly with the caps.
Process in the boiling water for an additional ten minutes, if desired.
Store in the panty up to a year.