Place fish fillets and teriyaki sauce in a large resealable plastic bag or container. Move fillets around to coat evenly with sauce. Refrigerate for at least 1 hour and up to 12 hours.
Insert grill plate in unit and close lid. Select GRILL, set temperature to MAX and set time to 8 minutes. Select START/STOP to begin.
When the unit beeps to signify it has preheated, place fillets on the grill plate, gently pressing them down to maximise grill marks. Close lid and cook for 6 minutes. There is no need to flip the fish during cooking.
After 6 minutes, check fillets are cooked; the internal temperature should be 75°C. If necessary, close lid and continue cooking up to 2 more minutes.
When cooking is complete, serve fillets immediately.
