The Argentine choripán consists of a sausage made out of beef and pork, hot off the grill, split down the middle, and served on a roll. The chorizo may be used whole or cut in half lengthwise, in which case it is called a mariposa. It is customary to add sauces on the bread, most likely chimichurri. Choripanes are commonly served as an appetizer during the preparation of an asado, but they are also very commonly sold at sport venues and on the sides of roads and streets in major cities in Argentina. Taxi cab drivers in Buenos Aires are avid consumers and some street sellers can gather a long line of cabs during lunch time and afternoons when drivers get their lunch break.
Brazil
There are several Brazilian versions of choripán, the one most resembling the Argentinian version is called salsipão, and made, in southern Brazil, with "French bread" and pork sausage. It is often served as an appetizer during the preparation of a churrasco, or even as a substitute for barbecues, because salsipães are much cheaper, easier, and quicker to make, so they can be prepared on a short notice. Elsewhere in the country, there are many variations on the popular sanduíche de linguiça, most also made with Pão francês and pork sausage, but other breads and sausages can also be found. Possible additions to the basic recipe include melted cheese, requeijão, sautéed onions, vinaigrette sauce, shoestring potatoes, mustard, hot sauce, and many others. It is usually served as a casual meal, perhaps with a cold beer, very popularly on road-side dinners.
Chile
In Chile, choripanes are very popular, particularly consumed as a classic appetizer during asados. Traditionally served in marraqueta and topped with aji and pebre, also mayonnaise is commonly used. Chilean choripanes are also made with longanizas instead of chorizos.
Puerto Rico
Usually sold in bakeries, they consist of a Spanish-style chorizo such as chistorra or cantimpalo, pickles and mayonnaise inside a typical home made Dominican bread called "pan de agua". Other ingredients may be added, Manchego cheese and ketchup being popular ones.
Uruguay
The chorizo is sausage made of pork, may be used whole or cut in half lengthwise. Usually the sauce chimichurri is used as well as mayonnaise, sometimes Uruguayans tend to add tomatoes and lettuce. It's served in baguette or in "pan catalán", except in football matches where is served in simple bread roll or bun. Unlike in Argentina, chorizo is not only used as an appetizer but also as a garnish for the asado.
U.S.
In the U.S., they are commonly available at lunch counters in Miami's Cuban diners and cafes, where the sandwich is customarily served on Cuban bread and topped with raw or fried onion and popularly eaten with a tropical fruit shake.
