Cook and stir hamburger, celery and onion until hamburger is light brown, then drain. Pour water on rice and add salt in greased 2 litre casserole. Stir in hamburger, soup, mushrooms, sugar, soy sauce and margarine. Cover and cook in 180ÂșC oven for 30 min; stir. Cook uncovered for 30 min longer. Stir in noodles, serve immediately. Note: Water chestnuts or bamboo shoots may be added if desired.