Olive juice, often referred to as olive brine, is a liquid ingredient derived from the solution in which olives are cured. It has a salty and slightly tangy flavor profile, making it a unique addition to various culinary and beverage applications.

In the context of cocktails, olive brine is primarily used in martinis, especially the Dirty Martini, where it adds a savory, salty depth that complements the gin or vodka base. The inclusion of olive brine in cocktails can enhance the overall taste experience, providing a distinct, complex flavor that balances the other ingredients.