The primary ingredient in a Caesar salad dressing is romaine lettuce, which is typically paired with a variety of ingredients to create a rich and flavorful dressing. However, more traditionally, the actual dressing itself is made from elements like olive oil, garlic, lemon juice, egg (often raw or coddled), Worcestershire sauce, and Parmesan cheese. Anchovies are also commonly included, contributing to the dressing's distinct umami flavor. This combination results in a creamy, tangy dressing that complements the crisp romaine lettuce, often garnished with croutons and additional cheese for a classic Caesar salad experience.