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In a shallow dish, mix soy sauce, mirin, rice vinegar and sesame oil. Add the tuna and turn to coat. Set aside for 10 minutes at room temperature.
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To make the soy ponzu dressing, whisk together soy sauce, lime juice, rice vinegar, honey, garlic and neutral oil in a small bowl. Set aside.
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In a large bowl, toss shaved fennel with the rocket, chilli, coriander, mint, and sesame seeds. Chill until ready to serve.
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Heat a non-stick frying pan over high heat. Remove the tuna from the marinade and pat dry. Sear the tuna for 20-30 seconds on each side until the edges are just coloured but the centre remains rare. Transfer to a plate and rest for 5 minutes.
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Slice the tuna into thin slices. Divide the fennel salad between plates, top with seared tuna, and drizzle over the soy-ponzu dressing. Season with freshly ground black pepper.