What additional ingredient does a Dirty Martini contain?

A Dirty Martini is a variation of the classic Martini that incorporates the addition of olive juice, which gives it a distinctive flavor profile. The olive juice serves to add depth and a touch of brininess to the drink, complementing the gin or vodka that forms the base of the Martini.

In this context, the other choices do not fit the traditional definition of a Dirty Martini. Tomato juice is typically associated with cocktails like the Bloody Mary, while simple syrup is commonly used in sweeter cocktails. Lemon juice might be found in other variations of the Martini but does not contribute to the signature taste of a Dirty Martini. By including olive juice, the cocktail not only gains its unique salty taste but also connects to the garnish typically used in this drink—an olive.