How to grill yellowfun tuna steak. There are four easy steps to grill yellow fun tuna. 1. Season your tuna steak 2. Cook the Tuna on Low Heat Tuna is the fastest fish and can swim at 28mph. 3. Cook the steak tuna 3 mins on each side. The yellowfin tuna is among the larger tuna species, reaching weights of over 400 lbs. 4. Flip the tuna steaks over at 3 mins. Yellowfin tuna prey include other fish, pelagic crustaceans, and squid. Yellowfin tuna is also eaten raw as sashimi. This is my second favorite sushi. Yellowfin tuna is becoming a popular replacement for the severly depleted supplies of southern bluefin tuna. Perfect Yellowfin Tuna Steak with pink in the middle! Please Subscribe to see my other cooking videos.