Slice the bread rolls into small pieces and soak them in warm water. Squeeze them out very well, to draw out the moisture. Otherwise, your filling might end up being too wet.
1 bread roll
Place the ground beef into a large bowl. Add the bread pulp, onion, egg, and seasonings. Knead the ingredients with your hands until combined.
Remove 8 large outer leaves from your cabbage head. The exact quantity depends on the size of your cabbage.
1 cabbage head
Heat a large pot of water and bring to a boil. Place the cabbage leaves in the water for approximately 2-3 minutes to soften. Then remove them from a pot and dry them on a kitchen towel. Do not blanch them for too long, as otherwise, the cabbage leaves will fall apart.
Remove the thick stem of the cabbage leaves. Divide the beef mixture into 8 equal portions. Lay a cabbage leaf flat and place one portion of the filling into the center of the leaf. Fold in the sides and roll the cabbage up. Secure the cabbage leaves with kitchen yarn, so they don't unwrap while cooking.
In a large pot, head up the oil and sear the cabbage rolls, seam side first, on high heat from all sides.
3 tablespoon vegetable oil
Remove the cabbage rolls and fry the onions and carrots, in the same pot on medium heat until the onions are translucent. Add the brown sugar and cook until the onions and carrots caramelize. Add the tomato paste and fry for a minute before pouring in the beef broth/stock and adding the bay leaves.
1 onion, 2 carrots, 1 tablespoon brown sugar, 800 ml beef stock, 2 bay leafs, 1 tablespoon tomato paste
Place the cabbage rolls back into the saucepan and cover the pot with a lid. Cook for approximately 45 minutes on a low heat.
Remove the cabbage rolls and bay leafs from the pan. Bring the remaining liquid to a boil until it reduces to a brown gravy. You can thicken the sauce with cornstarch if desired. To do this first mix 1 tablespoon of cornstarch with 2 tablespoons of water and add to the cooking sauce. If the sauce is still not thick enough add a second. Season with salt and pepper to taste.