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INGREDIENTS (Nutrition)
2 pounds mahi mahi fillets
1/2 cup dark rum
1/2 cup fresh lime juice
2 onion, sliced into thin rings
1 lemon, sliced
2 teaspoons dried oregano
4 tablespoons butter
ground black pepper to taste

..DIRECTIONS
1.Arrange the fish fillets in an oven proof 9x13 glass baking dish. Pour the rum and lime juice over the fish and place a slice onion on each fillet. Cover and refrigerate for 2 to 4 hours. 
2.Preheat oven to 325 degrees F (165 degrees C). 
3.Remove fish from the refrigerator and pour off about 3/4 of the liquid. Leave the onion slices in the dish and place a thick slice of lemon on each fish fillet. Sprinkle with oregano and black pepper to taste. Place a pat of butter or margarine on each fillet. 
4.Bake, covered, at 350 degrees F (165 degrees C) for about 20 to 30 minutes or until fi