Cook bacon in a Dutch oven until crisp; drain on paper towels, reserving drippings in pan. Crumble bacon, and set aside.
Add vegetable oil to pan drippings; whisk in flour. Cook over medium-low heat, stirring constantly, until roux is caramel colored (about 25 minutes). Add celery and next 3 ingredients; cook, stirring constantly, 10 minutes or until tender.
Stir in broth and next 4 ingredients; bring to a boil. Reduce heat, and simmer, uncovered, 1 hour, stirring occasionally and skimming as necessary. Stir in okra and next 3 ingredients; bring to a boil. Reduce heat, and simmer, uncovered, 30 minutes.
Sauté mushrooms in butter in a large skillet over medium-high heat 3 to 4 minutes or until liquid evaporates. Add to broth mixture.
Add bacon, scallops, and next 3 ingredients to broth; bring to a boil. Reduce heat, and simmer, uncovered, 5 minutes or until scallops are done; discard bay leaves. Serve over hot rice. Sprinkle with pepper.
I substituted shrimp (same amount) for the scallops and didn't use the mushrooms. LOVED IT!!!!! Such a wonderful change from traditional gumbo (which I love as well). Definately add File powder either while making the roux or just at the end for flavour.
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