Tuna Salad

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2 pounds very fresh tuna steak, cut 1-inch thick

4 tablespoons olive oil, plus extra for brushing

2 1/2 teaspoons kosher salt, plus extra for sprinkling

1/2 teaspoon coarsely ground black, plus extra for sprinkling

2 limes, zest grated

1 teaspoon wasabi powder

6 tablespoons freshly squeezed lime juice (3 limes)

2 teaspoons soy sauce

10 dashes hot sauce (recommended: Tabasco)

1 to 2 ripe Hass avocados, medium diced

1/4 cup minced scallions, white and green parts (2 scallions)

1/4 cup red onion, small diced