My grandparents were very poor, so they never put meat in their bierock, only cabbage and onions. They came to this country in 1901 from German/Russian Volga River area.
I have made the receipe a little easier by using frozen dinner rolls. Let the dinner rolls rise, while cooking a head of cabbage with one whole large onion, salt and pepper to taste. Roll out each roll placing a scoop of cooked cabbage in the center. Melt butter in a oblong cake pan, put bierock in coating both sides, bake untill lightly browned. Enjoy.