You simply must use Antica Formula. This is the original vermouth from Guiseppe Carpano of 1786. It remains the best today, especially for the legendary Manhattan.
Get your makers mark ready.. Overproof slightly but just right.
Have the bitters handy and ready to dash.
Have the Bordeaux cherries ready. One for each glass.
Have the cocktail glasses in the freezer and don't pull them out until you're ready to pour. Add the cherry just before pouring.
Stir and pour the mix into the frosted cocktail glass. Top with a single dash of bitters. Serve immediately. Enjoy the best Manhattan.