Heat oil over medium heat in a large saucepan, add flour and stir to prevent clumping. Keep stirring constantly and cook for about 10 minutes or until roux is brown.
Once you have achieved that brown color, add the yeast flakes, onion, garlic, celery, bell pepper, green onion and cook for about 5 minutes stirring constantly.
Stir in vegetable broth, diced tomatoes, Creole seasoning, thyme, parsley, basil, cayenne pepper, and bay leaf. Bring to boil stirring, allow to thicken and for flavors to blend, about 10 minutes.
Meanwhile, lightly sauté chopped sausages in a skillet until brown. Add okra, sausage, and soy curls to the base and cook for 10 more minutes or until okra is tender. Delicious served over brown rice.