DIRECTIONS
In a small bowl, combine pineapple juice, grapeseed oil, sesame oil, soy sauce, garlic, ginger and black pepper. Whisk all the ingredients until well blended.
Put marlin steaks in a large re-sealable bag and pour the marinade over. Close the bag and massage/flip it until the steaks are well coated. Transfer to the refrigerator for 1 to 1 ½ hours, turning and massaging steaks once or twice.
Preheat barbecue to 500-550ºF.
Place the marlin steaks on a plate and discard the marinade.
Transfer the steaks on the hot grill, close the lid and grill for 3 minutes on one side. Flip them and cook for another 2 minutes with the lid closed.