In large, non-stick skillet over medium-high heat, sauté sausage, onion and celery 10 to 12 minutes or until sausage is not longer pink and vegetables are tender. Reduce heat to medium, stir in bulgur and cook 5 minutes to brown. Add broth, raisins, walnuts, thyme, sage and pepper; bring to boil. Reduce heat to low, cover and simmer 15 to 20 minutes or until all liquid is absorbed.