I love elderflower and as E 's are a bit thin on the ground in terms of great baking entries, I give you elderflower. The slightly alcohlic version St Germain is wonderful- in champagne, gin, lemonade- oh heck in anything!
One of my very early posts was of an elderflower genoise and the link is here Elderflower genoise | vannillarock. Revisiting early posts is a shocker- the photography, the layout, ouch, the everything- it is however a very nice cake, and there is no getting away from now nice elderflower is.
Have a wonderful day.