1. Bring a large pot of water to a boil. Place the whole cabbage into the water and simmer until outer leaves soften. Carefully remove and peel large leaves. Let them cool.

2. In a large bowl, mix together ground beef, cooked rice, chopped onion, minced garlic, egg, paprika, salt, and pepper until well combined.

3. Lay one cabbage leaf flat, place some filling in the center, fold the sides in, and roll tightly like a burrito. Repeat with remaining leaves and filling.

4. Arrange rolls seam-side down in a baking dish or Dutch oven. Mix tomato sauce with brown sugar and vinegar, and pour over the rolls until just covered.

5. Cover the dish with foil or a lid and bake at 350°F (175°C) for 1.5 to 2 hours until the cabbage is tender and the filling is cooked through.

6. Let rest for 10 minutes before serving.