Shred cabbage and combine with crumbled hamburger and chopped onion in skillet. Add salt and pepper to taste. Cook on medium to low and stir occasionally. Add small amount of water if mixture becomes too dry. Mixture should steam more than fry. Prepare bread dough and roll on a lightly floured surface. Cut dough into 3 or 4 inch squares. Put filling into centers, bring up corners and pinch shut. Place seam side down on greased pan. Bake at 375 degrees for 30 minutes or until done. Makes approximately 2 dozen.