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Set a heavy skillet, such as a cast-iron skillet, or grill pan on the stove and turn the burner to medium-high. Heat the pan for at least 5 minutes before you sear the tuna steaks. The skillet or grill pan should begin to smoke. Open a window or turn on your oven vent to prevent your kitchen from getting too smoky as you cook. Once the tuna steaks are a rich golden color and they start to flake around the edges, turn off the burner. Transfer the tuna steaks to a serving plate and leave them to rest for 5 minutes so they finish cooking. Then, serve the pan-seared tuna with your favorite sides. Consider serving the tuna steaks with red beans and rice or baked potatoes. Store leftover tuna steaks in an airtight container in the refrigerator for up to 3 to 4 days.
Heat a skillet or grill pan to medium-high heat. Remove the tuna steaks and let them rest for 5 minutes before serving.