StoneGRMI

1/2 cup dark soy sauce
1/2 cup honey
1/4 cup dry wasabi powder
2 pounds tuna loin, cut into 2 pieces
1/2 cup sesame seeds
2 tablespoons peanut oil

In a non-reactive bowl combine soy, honey, and wasabi powder. Reserve 1/4 cup for dipping sauce. Roll each piece of tuna in this mixture to coat evenly. Marinate from 1 hour to overnight. Remove the tuna from the marinade and discard the marinade.
On a plate, lay the sesame seeds. ...