For those fearful of the quantity of chartreuse in this recipe, your bravery will be rewarded when trying this recipe!! Chartreuse is an acquired and intense taste. Personally, I am apprehensive of any recipe that calls for more than 15 mL of the stuff. However, I tried this recipe on a whim because it stood out from the vast array of Manhattan or old fashioned riffs when searching for rye nightcaps. This is going in my “best of” cocktail notebook.