Brown sausage in heavy bottom or cast iron pot on medium, avoid stirring allow sausage to brown. Add onion, celery, and green pepper and sauté. Allow vegetables to soften and brown. Add tomato paste, allow to brown. Add rice, allow grains to cook and turn translucent. Add stock, tomatoes, and seasoning.
Bring to boil, then simmer covered for 20 min, turn heat off, allow to stand 5 minutes, rice will be tender. Add chicken and green onions, serve with warm poboy bread.