The Turkish street food of a baked potato loaded with toppings such as cheese, butter, and vegetables is called kumpir.
Kumpir begins with a large potato baked until its skin is crisp and its interior is soft. A vendor cuts it open, mixes the flesh with butter and cheese, and then adds a customer’s chosen toppings. Common choices include olives, corn, pickles, peas, carrots, Russian salad, and sausage.
The dish is especially associated with Istanbul’s Ortaköy neighborhood, where kumpir shops and stands became a popular attraction. Its customizable format makes it suitable for many tastes, from simple butter-and-cheese versions to heavily loaded combinations.
Kumpir is sometimes mistaken for ordinary jacket potatoes, but the Turkish street-food version is defined by the aggressive mixing of the hot potato interior with butter and cheese before toppings are added. It is usually eaten with a fork directly from the potato skin.