from The Craft of the Cocktail
Stir both ingredients to chill and strain into a chilled martini glass. No garnish.
Gary and Mardee Regan have supplied me for a couple of years now with orange bitters prepared from a recipe that appeared in the 1862 first edition of Jerry Thomas's How to Mix Drinks. Gary and Mardee also spend plenty of time in their bar/laboratory creating recipes of their own. This is their recipe.