Delicious Stuffed Cabbage Rolls with Beef and Rice

Ingredients

• 1 large green cabbage, about 2 1/2 lb (1.1 kg)
• 1 tablespoon olive oil
• 1 small yellow onion, finely chopped
• 3 cloves garlic, minced
• 1 can (28 oz / 795 g) crushed tomatoes
• 1 can (15 oz / 425 g) tomato sauce
• 1/2 cup (120 ml) beef broth
• 1 tablespoon brown sugar
• 1 tablespoon apple cider vinegar
• 1 teaspoon sweet paprika
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 3/4 lb (340 g) ground beef
• 1/2 lb (225 g) ground pork
• 1 1/2 cups (250 g) cooked white rice, cooled
• 1 large egg, lightly beaten
• 2 tablespoons chopped fresh parsley, plus more for serving
• Sour cream, optional for serving