Elderflower is prevalent on the nose, but the gin is most definitely up front on the palate, followed by the St-Germain and finishing with the citrus sourness. A very easy drinking.
Made this two times, both with aquafaba. Tasty both times, but I actually got better results in terms of texture by dry shaking first, then adding ice. Shook for 40 seconds each time followed by a single throw.
I think this is better without the egg white, I also used all lime as i couldn't be bothered to squeeze 2 different fruits, and it seemed to work ok. Nothing wrong with any gin and elderflower cocktails, they seem to go together very well.