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Heat 1 tablespoon canola oil in a 4.5 quart or larger pot over medium heat.
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Add celery, onion, bell pepper, chicken, and sausage and cook for 10 minutes.
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Remove mixture from pot and set aside.
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Reduce heat to medium.
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Add 1/2 cup canola oil and stir in flour to make a roux.
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Stir in Cajun seasoning and let cook for a minute or more depending on how dark you want your gumbo to be.
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Very slowly stir in chicken broth, stirring constantly to avoid lumps.
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Increase heat to medium-high and bring mixture to a boil and let boil for about 10 minutes or until it starts to thicken slightly.
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Reduce heat to medium and add shrimp, crab, and okra, and add chicken mixture back into pot as well.
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Cook for 10 minutes or until heated through.