Prepare the Lilacs: Gently pull the flower petals from the green stems. Make sure you are using a common lilac and the lilac bushes are unsprayed, and chemical-free.
Mix Petals with Sugar: In a mixing bowl, combine the fresh lilac petals with granulated sugar. Stir them together, so the individual flowers are evenly distributed throughout the sugar.
Pulse in Food Processor: Transfer the lilac and sugar mixture to a food processor. Pulse a few times, just until the petals are finely chopped and the lilac aroma is released. Avoid over-processing to prevent the sugar from becoming too powdery.
Store the Sugar: Spoon the lilac sugar into a clean jar or any airtight container. Secure the lid to preserve the fragrance and prevent moisture from getting in. Store your glass jar of floral sugars in a dry place and out of direct sunlight.