Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
                        gingered pineapple marinade
   1 1/4  pounds        mahi mahi fillet -- 1/2--3/4 thick
   4      slices        fresh pineapple -- 3/4" thick
                        ***GINGERED PINEAPPLE MARINADE***
   1 1/2  cups          unsweetened pineapple juice
     1/4  cup           reduced sodium soy sauce
   3      tablespoons   packed brown sugar
   1      tablespoon    sesame oil
   2      teaspoons     grated ginger root
   1 1/2  teaspoons     finely chopped garlic
     1/2  teaspoon      crushed red pepper
   4      medium        green onions -- chopped (1/4 cup)

Preparation:

Prepare Gingered Pineapple Marinade by mixing all ingredients. Remove 1 cup of the marinade; cover and refrigerate remaining marinade for basting. Cut fish into 4 serving pieces. Place fish in shallow glass or plastic dish. Pour 1 cup marinade over fish. Cover and refrigerate, turning once, at least 2 hours but no longer than 12 hours. Generously spray grill rack with nonstick cooking spray before heating grill. Heat coals or gas grill. Remove fish from marinade; discard marinade. Cover and grill fish and pineapple about 4 inches from medium heat 8 to 12 minutes, brushing frequently with reserved marinade and turning once, until fish flakes easily with fork. If pineapple becomes too brown, remove from grill.) Discard any remaining basting marinade.