1. Cook the sausage over low heat in a large skillet, pouring off grease now and then and stirring to crumble the meat. Combine the chopped onion, green pepper and celery and set aside.
2. Add the soup mix to the boiling water and continue boiling for 7 minutes. Do not drain.
3. Combine the soup mixture, vegetables and sausage and mix well.
4. Pour into a large (2-quart) casserole. Sprinkle top with slivered almonds and chopped parsley. Cook 25 minutes.