Preheat oven to 400° F. Lightly grease a 9 x 13-inch pan with non-stick cooking spray.
Place soy sauce in deep bowl.
Rinse tuna and pat dry. Dip in soy sauce.
Remove tuna and place in prepared pan.
Brush or drizzle with sesame oil and sprinkle with sesame seeds.
Bake, uncovered, at 350 degrees for 8 to 10 minutes for medium, or until desired doneness.
Mix all sauce ingredients in a small bowl.
Arrange tuna on individual plates and drizzle with about half the sauce. Serve remaining sauce on the side for dipping. Garnish with pickled ginger if desired.
Contributed by: Quick & Kosher, JAMIE GELLER