1 pound tuna
1 tablespoon tamari
½ tablespoon toasted sesame oil 
½ tablespoon rice vinegar
1 teaspoon minced garlic
1 teaspoon minced fresh ginger
1 tablespoon scallion, thinly sliced

Combine everything but the tuna in a non-reactive container. Add tuna and marinate for ½ hour.  Heat grill to medium hot. Brush grill grates well with oil. Sprinkle tuna with salt and pepper. Grill for approximately 2 to 3 minutes per side for rare. If cooking indoors, heat grill pan or cast-iron skillet to medium high. Cook for approximately 3 minutes per side.
 

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