Marinate the tuna fillet with salt, pepper and lemon juice.
Coat the fillet with sesame seeds.
Cut the radish or daikon into thin julienne and keep aside.
Heat a pan, sprinkle few drops of sesame oil and place the tuna. Briefly cook each side of the tuna till the sesame seeds become light brown which should not take more than three minutes.
Remove the tuna from the pan using a very sharp knife and slice it thin lengthwise.
Serve the thinly sliced tuna over julienned daikon.
Serve with pickled ginger, wasabi and drizzle with light soya.
Recipe by Voyageur Chic at http://voyageurchic.com/searedtuna/