A classic Italian sauce that is made with tuna and anchovies that are puréed with egg yolks, lemon juice, olive and tuna oil, and seasonings. The sauce, which has an appearance similar to mayonnaise, is traditionally served over veal. This dish is known as "vitello tonnato,' an Italian meal consisting of marinated veal, which is cooked and allowed to chill for a day before being thinly sliced, topped with the tonnato sauce, and served cold. There are now numerous variations of this classic recipe that substitute turkey, chicken, and fish for the veal.