Place a saute pan large enough to hold all the ahi steaks in one layer into the oven and heat well for about 5 minutes. While pan is heating, lightly brush steaks using 2 teaspoons sesame oil. Combine the sesame seeds on a plate. Set steaks on plate with sesame seeds, turning and pressing to coat both sides. When steaks are coated, add remaining oil to hot pan; heat well and add steaks. Cook for 45 seconds, turn over, and cook for 45 seconds more. Remove and slice thinly to serve.