Preheat air fryer to 300 degrees F for 5 minutes. Spray inside basket lightly with non stick cooking spray.
Sprinkle salt on both sides of tuna steaks.
Lay inside basket without overlapping. Cook for 3 minutes. Then lower temp to 250 F and continue cooking for 2 more minutes.
This timing will vary slightly depending on how thick your steaks are but mine were average and this timing created a medium raw/seared on outside pink in middle which was perfect
Slice, plate with veggies, sprinkle with sesame seeds and green onions and enjoy.