3/4 cup teriyaki sauce
2 tablespoons soy sauce
2 tablespoons firmly packed brown sugar
1 tablespoon Sherry or white wine
1 tablespoon rice vinegar
1 tablespoon vegetable oil
1 teaspoon Asian sesame oil
3 garlic cloves, minced
a 1-inch piece fresh ginger root, peeled and chopped fine
2 scallions, chopped fine
a pinch dried hot red pepper flakes, or to taste
four 8-ounce tuna steaks
In a large shallow dish stir together all ingredients except fish until combined well and add fish. Marinate fish, covered and chilled, turning occasionally, at least 1 hour and up to 2.
Grill fish on an oiled rack set 5 to 6 inches over glowing coals about 5 minutes on each side for medium-rare, or until desired doneness. You can also broil or pan fry the fish in a hot skillet.