Cut the tuna into cubes of about 1 cm.
Peel and chop the ginger. This is easily done with a ginger grater, which sorts out the annoying "threads". After that, peel the garlic, chop it up and crush it with the back of a knife until it has reached a paste-like consistency. Now cut the onion into very fine slices.
Mix about 4 tablespoons of soy sauce in a bowl, add the ginger and the garlic paste. Add about 2EL of the lime juice and some grated lime skin if you like.
Jetzt kommt der rohe Thunfisch in diese Sauce, damit dieser schon etwas marinieren kann. Habt ihr während der Zubereitung schon vom frischen Thunfisch genascht, so müsst ihr Schritt 1 zunächst wiederholen ;)
Let's move on! Wash the radishes, quarter them, cut them into wedges and add them together with the onions to the tuna. Mix everything and cook for at least 2 minutes. 15 minutes Leave to infuse in the refrigerator.
And now it comes to the grand finale! A few spinach leaves for decoration (and of course also for the taste ;)) add to the bowl and top the whole thing with some grated lime zest and 1-2TL sesame seeds.