One of the great drinks. Like the Old Fashioned, it was traditionally made with American whiskey, but it stands up to variations with Australian whisky (we suggest Starward), Scotch (the Rob Roy), brandy and dark rum. Vermouth is the modifying agent here. Using sweet vermouth alone makes a sweet Manhattan, dry vermouth makes - yes - a dry Manhattan, while equal parts of both makes what is known as a Perfect Manhattan.
If you've got any Punt e Mes, Amer Picon or other amaro-like bittersweet concoctions lying around, try them in place of the sweet vermouth component. The best maraschino cherries for the garnish we've found locally are from Luxardo (we've found them for sale online at nicks.com.au). Some drinkers enjoy a splash of the syrup from the jar in the mix, somewhat like using olive brine in a Dirty Martini.