Heat oil in a large stockpot over medium heat; gradually whisk in flour, and cook, whisking constantly, until flour is a dark mahogany (about 30 minutes).
Stir in chicken broth and next 9 ingredients; bring to a boil. Reduce heat, and simmer, stirring occasionally, 2 1/2 hours. Add okra and cook 1/2 hour more.
Add shrimp and crabmeat to broth mixture; cook, stirring often, 15 minutes or just until shrimp turn pink. Stir in parsley. Remove from heat. Serve over hot cooked rice.
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