Make the roux by combining the flour and oil in a large dutch oven or other large heavy-bottomed pot. Cook and stir over medium-low heat for 30-45 minutes, stirring almost constantly, until dark brown, almost chocolate colored, and about cookie dough consistency.
1 cup all-purpose flour, 2/3 cup vegetable oil
Add the onions, celery, bell pepper, and garlic. Continue to cook for 7-10 minutes until softened.
1 bunch celery, 1 green bell pepper, 1 large yellow onion, 2 cloves cloves garlic
Meanwhile, brown the sausages in a large skillet over medium-high heat. Place them in an even layer and cook for 2-3 minutes per side, working in batches if needed. Use a fork to flip them. Transfer to a plate when done.
12 ounces Andouille sausages
Deglaze the pan with 1/2 cup of the chicken broth, then pour this into the pot with the vegetables and roux.
Add remaining broth, cajun seasoning, okra (if using), and parsley, and stir well. Bring to a boil over medium heat and cook for about 10-15 minutes until the okra is tender.
3/4 pound fresh or thawed frozen okra, 1-2 Tablespoons Cajun seasoning, 6-8 cups chicken broth, 1 bunch fresh parsley leaves
Add the sausages, cooked chicken, and shrimp. Continue to cook just until shrimp are pink. Adjust salt and pepper as needed. Serve warm over white rice with chopped green onions sprinkled on top.
1 bunch green onions, 1 rotisserie chicken, 1 pound raw shrimp, Cooked white rice