What primary ingredient is used in the Caesar salad dressing?

The primary ingredient used in Caesar salad dressing is anchovies. This ingredient is integral to the traditional flavor profile of Caesar dressing, providing a salty and umami depth that enhances the overall taste of the salad. The anchovies are usually pureed or finely chopped and blended with other ingredients such as olive oil, garlic, lemon juice, and Parmesan cheese to create that distinctive, rich dressing that characterizes a classic Caesar salad.

While olive oil, vinegar, and lemon juice are important components in many dressings, they are not the defining elements of Caesar dressing. In this case, it is the anchovies that give Caesar salad its unique and savory flavor that sets it apart from other salads.