Place pork in a large mixing bowl. Combine egg, carrots, onion, bread soaked in milk, 2 tbsp parmesan cheese, 2 tbsp bread crumbs and mix well. Season with salt and pepper. Shape half tablespoonful into firm meatballs. Heat oil in a large frying pan and fry meatballs in batches for 3 minutes, until browned. Add the tomato sauce and cook for 10 minutes over medium heat.