Step 1

Make dipping sauce. In a medium bowl whisk together soy sauce, rice vinegar, and honey until honey dissolves. Whisk in sesame oil, ginger, and garlic until emulsified. Leave at room temperature or refrigerate if desired. (recipe note #1)

Step 2

Preheat a gas grill (or charcoal grill) to high. (recipe note #2)

Step 3

Rinse tuna steaks and pat dry with paper towels. Rub all sides of tuna with olive oil and season with salt and pepper. Grill tuna 2 minutes per side, until seared on the outside and rare in the center. (If you prefer a cooked center, cook an additional ~2 minutes per side.) Transfer tuna to cutting board. With a thin, sharp knife, thinly slice tuna across the grain (1/4 to 1/2-inch thick slices). Sprinkle with sesame seeds and sliced green onion. Serve with dipping sauce.