Pierogi
Pierogi are a kind of food also known as pirogi, perogi, piroghi, piroshki, or pirozhki; some form the singular by removal of the '-i', while others treat these forms as singular and form the plural by adding '-s' (although such usage is considered poor by a few).They are small dumplings of virtually untraceable Central or Eastern European origin; claims have been staked for the Poles, the Russians, the Latvians, the Ukrainians, the Slovaks, and the Czechs.
Pierogi are square- or crescent-shaped dumplings of unleavened dough, stuffed with sauerkraut, cheese, mashed potatoes, cabbage, meat, hard-boiled eggs (the last is rather Mennonite-specific), or any combination thereof, or with a fruit filling. They are typically fried or boiled until they float and then covered with butter or oil; other ways include the Latvian method of glazing with egg white, baking, and serving with soup; the Mennonite tradition of baking and serving with borscht; and the Polish way of boiling, then frying in butter, and then topping with bread crumbs. Ones not fruit-filled are typically served with fried onions and/or sour cream.
Pierogi are popular throughout Russia, Central Europe, and Eastern Europe, including Greece, and in certain areas of North America, most notably Winnipeg, Manitoba, Canada; Ottawa, Ontario, Canada; Nebraska, U.S.A; and Pittsburgh, Pennsylvania, U.S.A..