Made it vegan and somewhat merged this and the Morgenthaler recipe - 45ml amaretto, 5ml bourbon, 25ml lemon, 2.5ml rich brown syrup, 10ml aquafaba. Very nice and foamy, though the lemon was a bit forward and hours later I'm still feeling the acid in my trachea (is this just me? the recipe here calls for a full 30ml...). Hope to try again son with 40ml amaretto/10ml bourbon/15ml lemon/5ml syrup.