Zapiekanka

A zapiekanka is a toasted open-face sandwich made of a sliced baguette or other long roll of bread, topped with sautéed white mushrooms, cheese and sometimes other ingredients such as ham. Served hot with ketchup, it has been a popular street food in Poland since the 1970s. The Polish word zapiekanka comes from the verb zapiekać, which means "to bake a dish so that its ingredients combine, and a crispy, browned crust forms on top,"[a] and may refer to various casseroles and other foods prepared in this manner. A typical zapiekanka is made from one half of a baguette, or any other long roll of white bread, cut lengthwise, as for a submarine sandwich. It may be up to 50 centimetres (20 in) long. The bread is topped with sliced, sautéed white mushrooms and grated cheese to form an open-face sandwich, which is then toasted until the bread becomes crisp and the cheese melts. Hard, mature yellow cheese with high fat content that melts well in heat, such as Gouda, Edam, Emmental, Tilsit or Cheddar, is best for this purpose; Polish smoked sheep milk cheese, such as oscypek, is also a popular choice. A zapiekanka is best served hot. The typical garnish is tomato ketchup, usually splattered on the cheese in a generous amount.

Source: Wikipedia