The main ingredient in a traditional Caesar salad is romaine lettuce. This crisp, leafy green forms the base of the salad, providing a fresh and crunchy texture. A classic Caesar salad typically also includes other ingredients such as croutons, Parmesan cheese, and Caesar dressing made from a blend of ingredients like egg, garlic, anchovies, lemon juice, and olive oil. The combination of these ingredients brings together both flavor and nutrition, making it a popular choice for salads in restaurants and homes around the world.