01 -
Arrange the frozen roll dough on baking trays with space in between. Cover and let rise at room temperature until doubled in size, about 3 to 5 hours.
02 -
In a large skillet over medium heat, cook ground beef until just browned. Add butter, then stir in onion and cabbage. Sauté until beef is fully cooked and vegetables are softened. Season with salt and freshly ground black pepper. Sprinkle in flour to absorb excess moisture. Remove skillet from heat and allow filling to cool slightly.
03 -
Preheat oven to 350°F. Flatten each risen dough ball into a round. Place a spoonful of cooled filling in the center, fold the dough over the filling, and pinch the edges to seal. Shape into balls and place seam side down on tray. Let assembled rolls rest for 30 minutes.
04 -
Whisk together egg and milk, then brush each roll with the egg wash. Bake for 18 to 20 minutes, rotating trays halfway through baking, until rolls are deeply golden.