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In a medium sized mixing bowl whisk together the teriyaki sauce, sriracha, sesame oil, and 1 tablespoon of the sesame seeds.
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Dice tuna and avocado into 1/2 inch squares and toss together in the mixing bowl with the sauce.
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Evenly distribute the mix into the romaine lettuce boats and top with the remaining sesame seeds.
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If you would like a little more of a kick drizzle more sriracha over the boats.