What ingredient gives a Bloody Mary its characteristic flavor?

The ingredient that gives a Bloody Mary its characteristic flavor is tomato juice. This key component not only provides the drink's distinctive taste but also serves as the primary base, contributing to its rich, savory profile. Tomato juice is often seasoned with various spices and flavorings such as Worcestershire sauce, hot sauce, and lemon juice, enhancing its complexity and making the Bloody Mary a popular choice for brunch and as a hangover remedy. Other juices listed in the options do not align with the traditional recipe of a Bloody Mary, as they either belong to different cocktails or do not provide the same depth of flavor that tomato juice does. This is what makes tomato juice integral to the identity of a Bloody Mary.