Admittedly, I used Calvados (Chateau de Breuil Fine, which based on reviews and on my palate, had Applejack-esque flavours {think whiskey, barrel}) and aquafaba. The result was a truly delicious sour that definitely rivals the Whiskey Sour. If it wasn't for picking a preferred whiskey, this is the best sour indeed. The apple and barrel flavours go so wonderfully with the sour and the sweet.