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Prepare the Ponzu Sauce: In a small bowl, whisk together the soy sauce, rice vinegar, lemon juice, orange juice, mirin, granulated sugar, minced garlic, and grated ginger. Set aside to allow the flavors to meld.
Prepare the Tuna: Pat the tuna loin completely dry with paper towels. Season all sides evenly with kosher salt and freshly ground black pepper. Place the black and/or white sesame seeds on a plate or shallow dish. Roll the tuna loin in the sesame seeds, pressing gently to ensure an even coating on all sides.
Sear the Tuna: Heat a heavy-bottomed skillet or cast iron pan over high heat until it begins to smoke lightly. Add the toasted sesame oil. Carefully place the sesame-crusted tuna loin in the hot pan. Sear each side for 30 to 60 seconds, depending on your desired doneness. The goal is a very thin, seared crust with the inside remaining rare.
Chill and Slice: Immediately transfer the seared tuna to an ice bath or place it in the refrigerator for 5 minutes to stop the cooking process. Once chilled, place the tuna on a cutting board and, using a very sharp knife, slice it thinly against the grain, about 1/4 inch thick.
Assemble and Serve: Arrange the sliced tuna on a serving platter. Drizzle generously with the prepared ponzu sauce. Garnish with thinly sliced green onions, julienned daikon radish, and a sprinkle of red pepper flakes, if desired. Serve immediately.

Prepare the Ponzu Sauce: In a small bowl, whisk together the soy sauce, rice vinegar, lemon juice, orange juice, mirin, granulated sugar, minced garlic, and grated ginger. Set aside to allow the flavors to meld.
Prepare the Tuna: Pat the tuna loin completely dry with paper towels. Season all sides evenly with kosher salt and freshly ground black pepper. Place the black and/or white sesame seeds on a plate or shallow dish. Roll the tuna loin in the sesame seeds, pressing gently to ensure an even coating on all sides.
Sear the Tuna: Heat a heavy-bottomed skillet or cast iron pan over high heat until it begins to smoke lightly. Add the toasted sesame oil. Carefully place the sesame-crusted tuna loin in the hot pan. Sear each side for 30 to 60 seconds, depending on your desired doneness. The goal is a very thin, seared crust with the inside remaining rare.
Chill and Slice: Immediately transfer the seared tuna to an ice bath or place it in the refrigerator for 5 minutes to stop the cooking process. Once chilled, place the tuna on a cutting board and, using a very sharp knife, slice it thinly against the grain, about 1/4 inch thick.
Assemble and Serve: Arrange the sliced tuna on a serving platter. Drizzle generously with the prepared ponzu sauce. Garnish with thinly sliced green onions, julienned daikon radish, and a sprinkle of red pepper flakes, if desired. Serve immediately.