Bierocks - Old Fashioned Volga German Hamburgers

Bierocks were a staple food item at family gatherings(weddings, reunions, funerals, etc.) in the central Kansas town I was raised. Grandma's recipe for this baked Volga German sandwich has been handed down through the generations. Basically a meat/cabbage mixture filled sweet roll that makes a great main dish, or in smaller sizes, an excellent appetizer. They reheat well, so I tend to make large batches and freeze for quick n easy meals. I have seen recipes across the internet adding shredded cheeses, or heaven forbid-a frozen dough, but the old German ladies never did!!