I posted the original recipe from Louisiana Cookin' Magazine.  In typical style, I changed it up and my changes are posted below.
1 cup vegetable oil
3/4  cup all-purpose flour
2½ cups finely chopped onion
5 cloves garlic, minced
2 bunches green onion, green parts finely chopped, white parts roughly chopped
½ large green bell pepper, seeded and chopped
1 (15-ounce) can tomato sauce
1 teaspoon chopped fresh thyme
3 fresh bay leaves
¼ teaspoon chopped fresh oregano
Juice of ½ large lemon
2½  cups water
1/4  teaspoon cayenne pepper
2 teaspoons salt
2½ pounds large fresh shrimp, peeled and deveined
Cooked long-grain white rice, for serving
Garnish: chopped green onion
- In
 a large heavy saucepan over medium-low heat, add oil; stir in flour, 
stirring constantly until a peanut butter-colored roux forms (10 mins in my cast iron skillet). Reduce 
heat to low and add onion, garlic, green onion, and bell pepper. Stir 
well, and cook until softened, 4 to 6 minutes.
 
- Stir
 in tomato sauce, thyme, bay leaves, oregano, and lemon juice. Increase 
heat to medium, and bring sauce to a simmer. Add 2½ cups water, cayenne,
 and salt, and simmer until thickened, 30 to 45 minutes.
 
- Gently
 stir in shrimp, reduce heat to a gentle simmer, and cook, covered, 
about 20 minutes. Let stand 10 minutes more. Remove and discard bay 
leaves. Serve over rice with green onion, if desired.
 
I liked this recipe but it needed something more.  I purchased some boneless, skinless chicken thighs and fried them up in the oil first.  I coated them with flour and about 2 - 3 tablespoon of cayenne, garlic powder and seasoning salt.  After frying, I added a little more oil to the pot then began making the roux as directed.
I diced then added the chicken at the end of step 2.
These changes made the roux spicier and added more bulk/less soupy to the meal.  Serve with French bread.