You can make as much or as little sugar as you would like.
Give your lilacs a good shake to be sure there aren’t any small bugs clinging on to any of the blossoms, carefully remove individual blossoms from the stems.
Fill the jar about 1/4 full with sugar, then add a large handful of lilac blossoms. Repeat with sugar & then lilacs until the jar is full.
Seal the jar and give it a good shake. Leave the jar in a cool, dark place for a couple of days, then sift out the flowers and use in recipes or add to tea :)