In a small mixing bowl, combine the black and white sesame seeds thoroughly. Set this blend aside for later use.
In a separate bowl, whisk together the soy sauce, olive oil, grated ginger, minced garlic, and a pinch of salt and freshly ground black pepper until well combined.
Using a paper towel, gently pat the ahi tuna steaks dry to remove excess moisture, ensuring a good sear. Then, brush both sides of the steaks evenly with the prepared soy sauce mixture.
Carefully press each side of the tuna steaks into the sesame seed mixture, making sure they are completely and evenly coated for maximum flavor and crunch.
Heat a non-stick skillet over medium-high heat. Once it’s hot, add a drizzle of olive oil, swirling it to coat the pan evenly.
Place the tuna steaks in the skillet and sear for about 1-2 minutes on each side for a rare finish. If you prefer your tuna more cooked, you can leave it on for a little longer, but take care not to overcook to maintain a firm yet tender exterior.
Once seared to your liking, remove the tuna from the skillet and allow it to rest for about 2 minutes before slicing it into thin strips across the grain for tenderness.
To serve, create a bed of mixed greens on each plate. Arrange the sliced avocado around the greens, then elegantly lay the sliced tuna over the top for a visually appealing finish.
Garnish with wasabi and pickled ginger presented on the side for an added kick and flavor enhancement.
Notes
For an artistic flair, drizzle any remaining soy sauce mixture from the skillet over the tuna before serving, and sprinkle with extra sesame seeds for a touch of elegance.