Heat oil and butter in a large frying pan over high heat. When oil is nearly smoking, place steaks in pan. Cook on one side for 3 to 4 minutes, or until blackened. Turn steaks, and cook for 3 to 4 minutes, or to desired doneness.
Something else.
Great recipe. You can also make on the barbecue by using a cast iron pan. Heat the pan on medium heat for 15 minutes. Halve the butter/oil and pour a small amount in the pan. Season tuna steak and put in pan. Smoke will be intense when you first put steaks in. Pour rest of butter/oil on steaks then turn. Cook for same amount of time as original recipe calls for. Steaks will be nice and blackened. I also use this recipe for swordfish. Very delicious too.
This recipe is very simple and takes little time. The only thing you need to watch out for is buying a cajun seasoning without salt. Because of the generous amount of seasoning you will put on the tuna, the salt content is extremely high if you choose a cajun seasoning with salt. Just a tip for people who need to watch their salt content.
Husband loved it! More salty than spicy, so I think next time I will add cayenne and other herbs to the Cajun seasoning to bring up the flavour without over-salting.
This was really simple, easy and, most importantly, absolutely delicious! Warning though: open up your windows and turn off the smoke detectors when cooking this because it does get smokey.