A Polish specialty, pierogi are half-moon-shaped noodle dumplings filled with a minced mixture, the most common being pork, onions, cottage cheese and seasonings. Mushrooms, cabbage, potatoes and rice are also used as filling ingredients. After the pierogi are cooked in boiling water, they're sometimes sautéed briefly in butter and topped with toasted bread crumbs. They can be served as a first course or side dish.