Combine the soy sauce, sake, mirin, and green onions to make the marinating sauce. Slice the tuna into adequate sizes for a nigiri sushi. Marinate the sliced tuna in the sauce for about 30 minutes in the fridge.
Take sushi rice and gently squeeze into round shapes. Top with wasabi, and then place the marinated tuna on top. Done!
Story Behind this Recipe
Since I'd never made nigiri sushi at home, I wanted to give it a try. The dining table looked festive with these nigiri sushi .
Make sure the sauce isn't dripping from the tuna when you're placing them on top of the rice.