Bierock

Bierock is a yeast dough pastry pocket sandwich with savory filling, originating in Eastern Europe. The dish is common among the Volga German community in the United States and Argentina. It was brought to the United States in the 1870s by German Russian Mennonite immigrants. It has developed strong cultural associations with the cuisine of the Midwestern United States, particularly in Kansas and Nebraska. The soft yeast rolls contain some sugar, butter and eggs, and either warm water, milk, or a mix of both. The filling is a basic mix of onion, ground beef and cabbage which can be made more complicated by the addition of different cheese blends, condiments and seasonings like caraway seeds.

Source: Wikipedia