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Saute the onion, green pepper, and celery in the butter over medium heat until softened.
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Add in the flour, and cook for a couple of minutes.
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Add in enough water, up to 1 1/2 cups, to get a consistency you like, then simmer for 15 minutes, stirring frequently.
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Add crawfish, green onions, and all the seasonings. Adjust the seasonings to taste.
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Simmer another 10 minutes.
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Serve over warm rice.