1. Bring broth and water to a boil in a large saucepan over high heat.
2. While broth mixture comes to a boil, place bread in a food processor; pulse until crumbs form. Remove casings from sausage. Combine sausage, 1/2 cup breadcrumbs, egg white, 1/2 cup green onions, and 1/4 cup chopped parsley in a medium bowl. Pat sausage mixture into a 6 x 4-inch rectangle; cut into 24 (1-inch) cubes. Roll sausage mixture into balls.
3. Add sausage balls, carrot, orzo, pepper, and salt to broth mixture. Reduce heat to medium-high, and simmer 10 minutes or until sausage is done and orzo is tender. Stir in remaining 1/2 cup green onions and remaining 1/4 cup parsley.