High Quality Content by WIKIPEDIA articles! 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.