Combine first 9 ingredients in a small bowl; toss gently. Cover and chill 1 hour.
Sprinkle blackening seasoning on both sides of fish, pressing down firmly to allow seasoning to adhere.
Heat oil in a heavy-duty cast iron skillet over medium-high heat. Add fish, and cook 4 minutes on each side or until fish is medium-rare or desired degree of doneness.
Oxmoor House Healthy Eating Collection
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