Vitello tonnato is a well-known Italian dish of cold, sliced veal

Veal

Veal is the meat of young cattle , as opposed to meat from older cattle. Though veal can be produced from a calf of either sex and any breed, most veal comes from male calves of dairy cattle breeds...

 covered with a creamy, mayonnaise-like sauce that has been flavored with tuna

Tuna

Tuna is a salt water fish from the family Scombridae, mostly in the genus Thunnus. Tuna are fast swimmers, and some species are capable of speeds of . Unlike most fish, which have white flesh, the muscle tissue of tuna ranges from pink to dark red. The red coloration derives from myoglobin, an...

. It is served chilled or at room temperature, generally in the summertime, as the main course of an Italian meal or as "an exceedingly elegant antipasto for an elaborate dinner." It is prepared at least a day or more in advance by braising or simmering a piece of veal from the back leg called Eye Round, which is then cut into thin, individual servings. The sauce is also made in advance. Tuna fish, which must be of the canned variety, is puréed in an electric blender or food processor with a kind of mayonnaise made of vegetable or olive oil

Olive oil

Olive oil is an oil obtained from the olive , a traditional tree crop of the Mediterranean Basin. It is commonly used in cooking, cosmetics, pharmaceuticals, and soaps and as a fuel for traditional oil lamps...

 and a variety of seasonings including anchovies

Anchovy

Anchovies are a family of small, common salt-water forage fish. There are 144 species in 17 genera, found in the Atlantic, Indian, and Pacific Oceans. Anchovies are usually classified as an oily fish.-Description:...

, egg yolk

Egg yolk

An egg yolk is a part of an egg which feeds the developing embryo. The egg yolk is suspended in the egg white by one or two spiral bands of tissue called the chalazae...

s, cayenne pepper

Cayenne pepper

The cayenne pepper—also known as the Guinea spice,cow-horn pepper, aleva, bird pepper,or, especially in its powdered form, red pepper—is a red, hot chili pepper used to flavor dishes and for medicinal purposes. Named for the city of Cayenne in French Guiana, it is a cultivar of Capsicum annuum...

, and lemon

Lemon

The lemon is both a small evergreen tree native to Asia, and the tree's ellipsoidal yellow fruit. The fruit is used for culinary and non-culinary purposes throughout the world – primarily for its juice, though the pulp and rind are also used, mainly in cooking and baking...

juice. This thick, smooth purée is then somewhat thinned with a little water and cooking liquid from the veal and a few capers are stirred in. Some of the sauce is spread out on a serving platter and the cold slices of veal are arranged in a single layer on top. The rest of the sauce is then poured over the veal so that it is, generally, completely covered. The dish is allowed to refrigerate for a period up to 5 days to fully develop the flavor.