Yield: 4 servings

* 4 ( 8 oz) 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

1. Arrange the fish fillets in an oven proof 9×13 glass baking dish. Pour the rum and lime juice over the fish and place sliced onions on each fillet. Cover and refrigerate for 2 to 4 hours.

2. Preheat oven to 325 degrees F.

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 for about 20 to 30 minutes or until fish flakes easily with a fork. Serve with the cooked onion and lemon slices.