To grill the tuna, get a charcoal or stove-top cast-iron grill very hot. Brush the fish with olive oil, and sprinkle with salt and pepper. Grill each side for only 2 to 2 1/2 minutes. The center should be raw, like sushi, or the tuna will be tough and dry. Allow to rest for 5 to 10 minutes and serve.
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