a type of stuffed dumpling

A Polish specialty consisting of half-moon-shaped noodle dumplings filled with a mixture, often of pork, onions, cottage cheese, and seasonings. Served as a first course or side dish.

Crescent-shaped Russian dumplings.

Pierogi are a kind of dumpling also known as perogi, perogy, piroghi, pirogi, or pyrohy. Most English-speakers treat these forms as singular and form the plural by adding -s, but a few consider them plural and form the singular by removal of the -i or -y. In Swedish however, the singular form is pirog and the plural form is created by adding -er at the end.