In a medium bowl, combine 2 cups of sugar and lemon zest by rubbing them together with your fingers until fragrant.
Optional: To dry your mixture, transfer to a baking sheet lined with parchment paper and spread evenly. Place in oven pre-heated in the lowest setting (or set to "keep warm"). Keep in oven for 10-15 minutes until the lemon zest is dry. Take out of oven and break apart any clumps that may have formed.
Transfer to an airtight container.
If you're drying your mixture, be careful not to overdo it. We want the lemon sugar dry, not caramelized.
To make breaking clumps easier, you can pulse the mixture in your food processor a few times.