1. Put cooking oil in a 3 qt. pot.
2. Add sausage and cook 10 minutes, drain oil, add onions, celery, garlic, pepper, tomatoes with juice, and mushrooms with juice; bring to a boil.
3. Salt and pepper to taste, add rice, mix well.
4. Lower heat to simmer, cover, and cook 45 minutes.
5. Do not stir while cooking.