I'm sure you can sugar just about anything...though I'm not sure if you can eat lilacs or if they should be put directly on a cakes surface...you'll have to check out the thread for that.............there's an article on the homepages about what flowers are safe to use on cakes.....sugaring anything is pretty much the same process, brush whatever you're sugaring lightly with egg whites and then sprinkle super fine sugar all over and put on a cooling rack until dry and hard. I would do them the night before if I were you. Just in case they starch to leach out liquid.
The lilacs cannot have been sprayed for pests, and you will want to let them sit in a slightly warm place to encourage any bugs out of hiding.
One thing to consider with very fragrant flowers. some people are very sensitive to fragrance. These flowers could make the cake inedible for those people.
Normally, to sugar flowers, you paint the petals with eggwhite/water mixture. you would probably have to dunk them or use a spray bottle to adequately cover the petals. Then fully coat the petals with superfine sugar (granulated sugar buzzed in a food processor works)
If all the petal is fully and completely covered in eggwhite and sugar, they can last several days. I actually kept sugarared violas for weeks in a tupperware container. But lilacs would have much more likely exposed surfaces, that would probably not be a good idea.
good luck Zmama! can't wait to see how they turn out! I'd love to try this, too - I have a purple lilac tree. always wanted a white one, though.
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