Combine the ground pork and beef in a large bowl and add the parsley, Worcestershire sauce, salt and pepper. Blend together well. Form the mixture into to 3/4 inch balls. Heat oil in a large soup pot over medium heat. Working in batches, add the meatballs to the pot and brown them on all sides, about 4 minutes. Transfer each batch to a bowl.
Pour off all but 3 tablespoons of the drippings from the pot. Add the potatoes, carrots, leeks and rutabaga and saute the vegetables for about 5 minutes to soften them. Add the broth and tomatoes with their juices.
Return the meatballs to the pot. Bring the mixture to a boil over high heat. Reduce the heat to medium and simmer, uncovered, until the meatballs and vegetables are tender, about 45 minutes.