So there's a few variations of this one floating around, which makes sense, as it's arguably the second most popular and widespread of the contemporary riffs on the Brooklyn Cocktail, after the Red Hook. The one in Sam Ross' Bartender's Choice app, the closest thing to an official Milk & Honey recipe book, is nearly identical to this one, except that it calls for regular sweet vermouth and two dashes of Ango rather than one. The one in Saveur, which the magazine seems to have gotten from McIlroy himself, calls for a full ounce of Punt e Mes and only a teaspoon of yellow Chartreuse, with a dash of Angostura and no orange bitters (http://www.saveur.com/article/Recipes/Greenpoint). These are all worthwhile variations, and it's hard to determine which one's the "correct" or original recipe. One thing that's sure, however, is that the drink's name should be spelled Greenpoint, after the Brooklyn neighborhood it's named for. :-)