Use the flat edge of a knife to press on the cardamon pods. Pry the pods open and empty out the seeds into a mortar and pestle and crush them with the pestle.
Add crushed cardamom seeds to a spice grinder along with 1 tablespoon sugar. Pulse until the cardamom seeds are equally dispersed and smaller.
Add the mixture to a food processor along with the rest of the sugar and pulse.
Add the lemon zest and Yuzu Essence to the food processor. Pulse until incorporated and then lay out on a baking sheet to dry out the sugar. Store in an airtight jar.