Ingredients

• 4 (4 ounce) fillets mahi mahi fillets
• 1 cup Italian-style salad dressing
• 1 pinch lemon-pepper seasoning, or to taste
• garlic powder, or to taste
• 4 raw onion rings
• 1 lemon, quartered

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Instructions

1. Arrange 4 large pieces of aluminum foil on a work surface.
2. Place 1 mahi mahi fillet onto each aluminum foil piece. Pour Italian dressing over each fillet. Sprinkle each fillet with lemon-pepper seasoning and garlic powder; flip fillets and season other side with lemon-pepper seasoning and garlic powder. Place 1 onion ring atop each fillet and squeeze lemon quarter over each fillet. Fold aluminum foil over each fillet, crimping all the corners to completely seal. Place packets in a glass baking dish in the refrigerator to marinate, about 2 hours.
3. Preheat oven to 325 degrees F (165 degrees C).
4. Bake in the preheated oven until fish flakes easily with a fork, about 30 minutes. Carefully open packets and remove onion before serving.