Bring broth and water to boil; add brown and wild rice. Bring to boil, reduce heat, cover and simmer 45 to 55 minutes or until rice is tender and liquid is absorbed. Sauté onion, celery and apples in butter, add sage and pepper. Add prepared rice and grapes; mix well. Adjust seasoning with salt if necessary. Place in 1-quart covered baking dish and bake at 350 F 20 minutes or until thoroughly heated.