Seared ahi tuna steaks: if you prefer to have your tuna seared here is what you do: bring a cast iron skillet or pan to high heat. Pat your tuna steak with paper towel. Season with salt and pepper then sprinkle some sesame seeds on both sides. Add a bit of oil to your pan and sear on both sides, about 30 seconds - 1 minute. Remove and slice immediately - add to your spicy tuna poke bowl!