The classic, standard ratio for a traditional Manhattan cocktail is 2:1—specifically two parts whiskey to one part sweet vermouth, along with a couple of dashes of aromatic bitters.
For a single serving, the standard recipe translates to:
- 2 oz (60 ml) Rye whiskey or Bourbon
- 1 oz (30 ml) Sweet vermouth
- 2 dashes Angostura bitters
Rye is the traditional choice because its spicy profile cuts through the rich sweetness of the vermouth, but a high-proof bourbon works wonderfully if you prefer a softer, sweeter profile.
Since you mentioned batching ahead for dinner, here are two important tips to ensure it tastes properly balanced:
1. Dilution: When you make a cocktail individually, stirring it with ice chills the drink and adds roughly 20% to 25% water by volume. If you plan to store the batch in the freezer or fridge and pour it directly into glasses, you will want to add about 0.5 to 0.75 oz of filtered water per serving into your batch bottle. If you plan to stir each pour over ice before serving, omit the water from the bottle.
2. Freshness and Garnish: Vermouth is a fortified wine, so keep your finished batch sealed in the refrigerator until dinner. Garnish each glass with a quality brandied cherry (such as Luxardo) right before serving.
