Forget the Filet-O-Fish; this may be the perfect fish sandwich. Blackening seasoning and sliced red onion add a little kick and the creamy avocado spread melts in your mouth. Make it a Meal: Serve with steamed asparagus or sauteed zucchini, oven fries and a salad.

Notes:

Ingredient note

Cajun seasoning is a spice blend that usually includes cayenne and black pepper, salt, thyme, garlic and onion powder and paprika. Look for it in the spice section of the supermarket. To oil a grill rack: Oil a folded paper towel, hold it with tongs and rub it over the rack. (Do not use cooking spray on a hot grill.)

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