The main ingredient of a Caesar salad is romaine lettuce. This crisp, leafy green serves as the salad's base and provides a refreshing crunch. Caesar salad is typically characterized by its creamy dressing made from ingredients like egg yolk, garlic, lemon juice, Worcestershire sauce, and Parmesan cheese. Other common components may include croutons and anchovies, providing additional flavor and texture. The salad's origins can be traced back to the early 20th century in Tijuana, Mexico, where it was created by restaurateur Caesar Cardini. Caesar salad has since become a popular dish worldwide, often served as a starter or side dish.