Peel and finely chop the ginger. Peel and wash the radish and cut into wafer-thin slices. Add boiling salted water to the radish, drain and allow to drain. Mix lime juice, vinegar and soy sauce, season to taste with salt, pepper and sugar. Slowly add sesame oil and 6 tbsp.
oil and fold into the sauce. Place the radish in the marinade and marinate for about 30 minutes. In the meantime, wash the fish, dab dry and season with salt and pepper. Cut the fish in half lengthwise. Roll the fish in sesame seeds all around. Heat 1 tablespoon of oil in a frying pan. Fry the fish for 1-2 minutes. Take out and cut into thin slices. Arrange radish and tuna as carpaccio on plates.
Heat 1 tablespoon of oil in a frying pan. Fry the fish for 1-2 minutes. Take out and cut into thin slices. Arrange radish and tuna as carpaccio on plates. Garnish with cress. Add soy sauce and wasabi if desired.
Waiting time approx. 20 minutes