1. Preheat your oven to 350°F (175°C).
2. Bring a large pot of water to a boil and carefully place the whole cabbage in the pot. Boil for about 10 minutes until the leaves are tender. Remove from the water and let it cool.
3. In a large mixing bowl, combine the ground beef, ground pork, cooked rice, chopped onion, minced garlic, egg, salt, and black pepper. Mix until well combined.
4. Carefully separate the cabbage leaves from the head. Take a leaf and place about 1/4 cup of the meat mixture in the center. Fold the sides over the filling and roll it up. Repeat with the remaining leaves and filling.