Make a roux by cooking flour and oil in a large pot until dark brown.
Add chicken stock and bring to a boil.
Add sausage, chicken, onion, bell pepper, and celery. Simmer for 30 minutes.
Add garlic, okra, thyme, salt, pepper, and Worcestershire sauce. Simmer for another 30 minutes.
Add half of the okra, and simmer for at least four hours, or up to six.
Add the remaining okra during the last hour of cooking.
Add shrimp during the last 15 minutes of cooking.
Season to taste with salt, pepper, and hot sauce.
Serve with white rice and filé powder.