What is the key ingredient adjustment in a "Filthy" martini?

In a "Filthy" martini, the key ingredient adjustment is the addition of more olive juice. This variation on the standard martini incorporates an extra splash of olive brine, which gives the cocktail a more pronounced salty flavor and enhances the overall richness. The additional olive juice not only affects the taste but also contributes to the drink's appearance, often creating a murkier look compared to a traditional clean martini that typically has minimal or no olive juice. The influence of the olive juice is central to defining the character of a "Filthy" martini, making it a favorite among those who enjoy a more robust, briny cocktail experience.