Wash wild rice 3-4 times. Cover with cold water in saucepan. Add 1 tablespoon salt and bring to a boil. Cover and simmer on low. Do not overcook.
Saute onions and celery in a skillet with a small amount of butter. Add ground beef and brown. Skim off excess grease. Season with salt and pepper to taste.
Put all ingredients together along with brown gravy. Place in casserole dish and sprinkle with shredded cheese of your choice.
Bake at 300° for 30-45 minutes or until heated through.