I just made this at home with what I had on hand. Definitely agree with Paul, this is an “All-Star” cocktail.

Though, my variation on it was to sub in a barspoon of soy lecithin concentrate in lieu of the egg whites (never really got fond of separating them). Saved dilution and an off smell and got a crystalline, delicate foam. Next time I might add in a 1:1 to see if it reacts the same way.