That sounds really good, so does the Wondrich one, though. The higher ratio of vermouth in his version will suit the drink on some occasions, but your addition of orange bitters is an inspired touch and one I use a lot. (If no orange bitters is available use regular bitters and add a dash of Grand Marnier or Triple Sec - the orange therein combines with the regular bitters to form something very like orange bitters).
Gary



