Dice the tuna into small, even cubes. It's important to use high-quality, sushi-grade raw fish. Julienne the carrot and cucumber into thin strips.
In a small bowl, whisk together the mayonnaise, sriracha sauce, and soy sauce until smooth and slightly spicy. Tip: taste and adjust the spiciness to your liking.
Add the sauce to the diced tuna and mix thoroughly. Let it rest for a few minutes to allow the flavors to meld.
Steam the bao buns in a bamboo steamer or over a metal strainer, covered, for 6-8 minutes. Avoid lifting the lid during steaming to keep the buns nice and soft.
Carefully open the bao buns and first add the carrot and cucumber â these will provide a fresh, crunchy base.
Fill with the spicy tuna mixture, then sprinkle with black sesame seeds and chopped chives. Tip: a squeeze of lime juice will further enhance the flavors.
Serve immediately! Bao is best when freshly steamed, and the cool, creamy tuna provides a great contrast to the warm bun.
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