similar flatbread dishes in Naples, Italy, in the 18th or early 19th century. Before that time, flatbread was often topped with ingredients such as garlic, salt, lard, and cheese. It is uncertain when tomatoes were first added and there are many conflicting claims. Until about 1830, pizza was sold from open-air stands and out of pizza bakeries. A popular contemporary legend holds that the archetypal pizza, pizza Margherita, was invented in 1889, when the Royal Palace of Capodimonte commissioned the Neapolitan pizzaiolo (pizza maker) Raffaele Esposito to create a pizza in honor of the visiting Queen Margherita. Of the three different pizzas he created, the Queen strongly preferred a pizza swathed in the colors of the Italian flag — red (tomato), green (basil), and white (mozzarella). Supposedly, this kind of pizza was then named after the Queen, although later research cast doubt on this legend. An official letter of recognition from the Queen's "head of service" remains on display in Esposito's shop, now called the Pizzeria Brandi. Pizza was taken to the United States by Italian immigrants in the late nineteenth century and first appeared in areas where they concentrated. The country's first pizzeria, Lombardi's, opened in New York City in 1905. Following World War II, veterans returning from the Italian Campaign, who were introduced to Italy's native cuisine, proved a ready market for pizza in particular. Preparation Pizza is sold fresh or frozen, and whole or in portion-size slices. Methods have been developed to overcome challenges such as preventing the sauce from combining with the dough, and producing a crust that can be frozen and reheated without becoming rigid. There are frozen pizzas with raw ingredients and self-rising crusts. Another form of pizza is available from take and bake pizzerias. This pizza is assembled in the store, then sold unbaked to customers to bake in their own ovens. Some grocery stores sell fresh dough along with sauce and basic ingredients, to assemble at home before baking in an oven. Baking In restaurants, pizza can be baked in an oven with fire bricks above the heat source, an electric deck oven, a conveyor belt oven, or, in traditional style in a wood or coal-fired brick oven. The pizza is slid into the oven on a long paddle, called a peel, and baked directly on hot bricks, a screen (a round metal grate, typically aluminum), or whatever the oven surface is.