01 -
Arrange frozen rolls spaced several inches apart on two baking sheets lined with parchment paper. Cover with plastic wrap and allow to proof at room temperature until doubled in size, about 3 to 5 hours.
02 -
In a large skillet over medium heat, brown ground beef. Once partially cooked, add butter, onion, and cabbage. Sauté until beef is fully browned and vegetables are softened. Season with salt and black pepper. Stir in flour as needed to absorb excess moisture. Let filling cool slightly before handling.
03 -
Preheat oven to 350°F.
04 -
Dust work surface lightly with flour. Flatten each risen dough ball into a round disk approximately 4 inches in diameter.
05 -
Place a generous spoonful of cooled filling in the center of each disk. Gather dough edges to enclose filling and pinch to seal. Gently roll to neaten shape. Position seam side down on the parchment-lined tray.
06 -
Cover assembled rolls with plastic wrap and let rest at room temperature for 30 minutes.
07 -
In a small bowl, whisk together egg and milk. Brush each roll lightly with the egg wash.
08 -
Bake rolls in the preheated oven for 18 to 20 minutes or until golden brown, rotating trays halfway through baking for even color.