Cook tortellini according to package directions. Meanwhile, in a large skillet, cook the beef, zucchini and onion over medium heat until meat is no longer pink; crumble beef; drain., Drain tortellini; add to skillet. Stir in the marinara sauce, water and pepper. Bring to a boil. Reduce heat; simmer, uncovered, for 5 minutes. Add the tomatoes, cheese, olives and 1 tablespoon basil. Sprinkle with remaining basil.