Directions
On a shallow plate or dish, combine the white and black sesame seeds.
Pat the Ahi tuna steaks completely dry with a paper towel, then season generously on all sides with salt and pepper.
Press each side of the seasoned tuna steaks firmly into the sesame seed mixture, ensuring a thick, even coating.
Heat the olive oil in a large skillet or cast-iron pan over high heat until it just begins to smoke. Carefully place the crusted tuna steaks in the pan.
Sear for 60-90 seconds per side for a rare center. The cooked portion on the sides should only be about ¼-inch thick. Avoid overcooking.
Remove the tuna from the skillet and set it on a cutting board to rest.
Reduce the heat to medium, add the coconut oil to the same skillet, and add the green beans.
Sauté the green beans for 4-5 minutes, or until tender-crisp.
While the beans cook, use a very sharp knife to slice the tuna against the grain into ½-inch thick pieces.
Serve immediately with the hot green beans.