Place of origin
Bierocks are meat-filled pocket pastries originating in Eastern Europe, possibly in Germany or Russia. The dish is common among the Volga German community in the United States and Argentina. It was brought to the United States in the 1880s by German Russian Mennonite immigrants. Bierock is filled with cooked and seasoned ground beef, shredded cabbage and onions, then oven baked until the dough is golden brown. Some variants include grated carrots.
Other spellings are bieroch, beerock, berrock, bierox, beerrock and kraut bierock in the U.S, and Pirok or Kraut Pirok in Argentina.
Bierocks are similar to the pirogi of Russian cuisine. It is likely that etymologically bierock (pronounced somewhere between "brock" and "brook" in Nebraska  and "beer-rock" in Kansas and Oklahoma) is borrowed from Russian or Ukraninian pirog, or from some other East or West Slavic vernacular.
- Rees, Amanda (2004). The Great Plains region. Greenwood encyclopedia of American regional cultures. Westport, Conn.: Greenwood Press. p. 253. ISBN 0-313-32733-5.
- Berch, Michael (May 2007). "Nebraska roundup, part 2". Archived from the original on 28 August 2008. Retrieved 2008-07-15.
- Secretary of Tourism of Argentina