In a shallow dish, combine the black and white sesame seeds and stir to mix.
Pat tuna dry. Season with salt and pepper and dredge in the sesame seeds, coating the tuna evenly.
Pour oil into a frying pan on medium-high heat, and heat until the oil is starting to smoke. Place tuna in the pan and cook until the white sesame seeds start to turn golden underneath, about 1 minute. Turn the tuna and cook the other side about another minute. (Mine was roughly triangular, so I browned on 3 sides).
Transfer the tuna to a cutting board and cut into 1⁄4-inch-thick slices. Arrange the tuna on individual plates, overlapping the slices. Serve immediately using the sauce for dipping or pouring over the slices.
Prevent your screen from going dark
Notes
If needed, cut tuna into 12-ounce “logs” or 6-ounce steaks
I am not a health professional and nutrition data is calculated programatically. Accuracy may vary with product selection, calculator accuracy, etc. Consult a professional for the best information.