What are the primary ingredients for a classic Martini?

The classic Martini is traditionally made with gin and dry vermouth. The correct combination typically involves gin and a small amount of dry vermouth, which is used to enhance the flavor of the gin without overpowering it. In this case, the primary ingredients should be three parts gin to one part dry vermouth.

While vodka can be used as a variation of the Martini, known as the Vodka Martini, the classic version specifically calls for gin. Sweet vermouth is not associated with the classic Martini; it's often used in other cocktails like the Manhattan. Understanding the distinctions in the ingredients is crucial for accurately preparing classic cocktails and engaging with guests who request classic recipes.