ellie, i found rosewater in an asian shop, you might try, as lebanese use it in many of their recipes. sunny ( australia)
I made this icing as is. The lavender and rose were in perfect harmony with each other.I tinted it a lovely lavender colour.
This smells so good and is delicious on top of lavender pound cake Lavender Pound Cake. I skipped the rose water (couldn't find it) and used regular tap water with delicious results. Thanks for sharing!