1. Heat oil in a large heavy saucepan over medium heat. Add garlic and saute until just golden, about 2 minutes. Add broth and water, raise heat to high, cover and bring to a boil.
2. Add tortellini and cook according to package directions. During the last 3 minutes of cooking, add meatballs. In the final minute, add spinach and stir until just wilted. Stir in pepper and divide among four bowls. Sprinkle with cheese and season with additional pepper.