Steakhouse-inspired seared ahi tuna with a savory crust and a tender, ruby-rare center. Finished with lemon and an optional quick mustard–soy dipping sauce for a light, restaurant-quality, halal-friendly entrée at home.
Pat tuna steaks very dry with paper towels. Brush lightly with oil so seasonings adhere.
In a small bowl, mix salt, black pepper, garlic powder, paprika, and cayenne (if using). Sprinkle evenly over both sides of the tuna and pat to help it stick. Roll the edges in sesame seeds if using.
Place a cast-iron or heavy skillet over high heat until very hot. Add the remaining oil and swirl until shimmering.
Gently lay the tuna in the skillet. Sear 45–60 seconds per side for rare (add 15–20 seconds per side for more doneness). Avoid moving the steaks while searing to form a good crust.
Transfer to a cutting board and rest 1–2 minutes. Slice thinly against the grain.
Squeeze lemon over the tuna and serve immediately.
Optional dipping sauce: In a small bowl whisk tamari or halal soy sauce, Dijon, rice vinegar, honey, wasabi, and ginger until smooth. Serve alongside the tuna for dipping.
Serving ideas: Pair with steamed jasmine rice, sautéed spinach, Asian slaw, or cucumber salad.