METHOD
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Defrost
If using frozen tuna, thaw it first. Thaw it in the refrigerator before preparing, then use it as soon as possible.
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preparation
Dip a 2–3 cm / 1 inch thick tuna steak in soy sauce on all sides. In a plate, mix the sesame seeds and black sesame seeds, then coat the tuna on both sides with the mixture.
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sear the steak
Place a pan over high heat, such as a Tefal Excellence+. Add the oil and tuna. Sear for 1 minute on each side and 10 seconds on the edges until nicely browned. This will give you a rare tuna steak. For medium, sear for 1 minute and 40 seconds on each side. For well done, cook for 2–3 minutes on each side. Set aside for 4–5 minutes to rest and allow the cooking process to finish.
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veggie side dish
Finely chop the spring onion and cucumber. Thinly slice the radishes. Place everything in a bowl and season with vinegar, soy sauce, and sesame oil.
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sauce
In a small bowl, mix the sauce ingredients: soy sauce, sugar, oyster sauce, sesame oil, and vinegar.
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serve
Divide the cooked long-grain rice between plates. Slice the tuna steak into thin slices and arrange it over the rice. Serve with the prepared vegetable side and sauce.