Once upon a time my Manhattan was, uh,
3 dashes Angostura bitters
1 oz rye whisk(e)y
1 oz sweet vermouth
Stir well over ice. Strain. Garnish with an olive.
adapted from For Home Use
There you have it. My current Manhattan, for the most part. I find Carpano Antica is a nice olive accompaniment. Also a good bold rye stands up well to both the garnish and the ratio.
*The book in which this recipe is found calls for (simple) syrup in the Manhattan recipe. This syrupless version is then the "dry" version and a third "extra dry" version calls for dry vermouth.