We can't reveal the whole recipe because it is a trade secret, however we will let you know that the pink color is derived from grapefruit juice and that drink is made with St.-Germain liqueur.
This liqueur is created from fresh hand-picked elderflower blossoms. Read more about this rare beverage on the St-Germain website here: http://www.stgermain.fr/story.php (must be 21 to enter)
