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Prepare the spicy sesame ginger dressing: In a small bowl, whisk together the soy sauce, rice vinegar, toasted sesame oil, grated fresh ginger, minced garlic, honey, fresh lime juice, and sriracha until well combined. Set aside.
Pat the tuna loins dry with paper towels. Season all sides generously with kosher salt and freshly ground black pepper.
Heat the olive oil in a large non-stick skillet or cast-iron pan over high heat until shimmering and almost smoking. If searing two loins, you may need to use two pans or sear them one after another.
Carefully place the seasoned tuna loins in the hot pan. Sear each side for 1 to 2 minutes, depending on your desired doneness. The goal is a deeply seared crust with a very rare interior. For 1 1/2-inch thick loins, about 1 1/2 minutes per side is usually sufficient. If searing in batches, ensure the pan reheats between loins.
Remove the tuna from the pan and immediately transfer it to a cutting board. Let it rest for 2 to 3 minutes before slicing. This allows the juices to redistribute.
Using a very sharp knife, slice the tuna against the grain into 1/4-inch thick pieces. Arrange the slices on a large serving platter or individual plates.
Drizzle the prepared spicy sesame ginger dressing generously over the tuna slices. Garnish with toasted sesame seeds, thinly sliced green onions, and avocado slices or diced avocado.
Serve immediately and enjoy this fresh, flavorful, and spicy dish.

Prepare the spicy sesame ginger dressing: In a small bowl, whisk together the soy sauce, rice vinegar, toasted sesame oil, grated fresh ginger, minced garlic, honey, fresh lime juice, and sriracha until well combined. Set aside.
Pat the tuna loins dry with paper towels. Season all sides generously with kosher salt and freshly ground black pepper.
Heat the olive oil in a large non-stick skillet or cast-iron pan over high heat until shimmering and almost smoking. If searing two loins, you may need to use two pans or sear them one after another.
Carefully place the seasoned tuna loins in the hot pan. Sear each side for 1 to 2 minutes, depending on your desired doneness. The goal is a deeply seared crust with a very rare interior. For 1 1/2-inch thick loins, about 1 1/2 minutes per side is usually sufficient. If searing in batches, ensure the pan reheats between loins.
Remove the tuna from the pan and immediately transfer it to a cutting board. Let it rest for 2 to 3 minutes before slicing. This allows the juices to redistribute.
Using a very sharp knife, slice the tuna against the grain into 1/4-inch thick pieces. Arrange the slices on a large serving platter or individual plates.
Drizzle the prepared spicy sesame ginger dressing generously over the tuna slices. Garnish with toasted sesame seeds, thinly sliced green onions, and avocado slices or diced avocado.
Serve immediately and enjoy this fresh, flavorful, and spicy dish.