Season the tuna steak with salt and pepper. Sear in a hot pan for 30-45 seconds on each side, leaving the inside rare (tataki style). Then, slice thinly. Julienne the daikon radish, carrot, and cucumber into thin strips.
In a small bowl, combine the soy sauce and grated ginger. This will be your soy-ginger glaze. In a separate bowl, whisk together the mayonnaise and wasabi paste for the spicy sauce.
Steam the bao buns in a bamboo steamer or metal strainer, covered, for 6-8 minutes. Avoid lifting the lid during steaming to maintain proper softness.
Carefully open the warm bao buns and place a small amount of radish, cucumber and carrot on the bottom of each. These will add freshness and crunch.
Top the vegetables with the sliced tataki tuna. Drizzle with the soy-ginger glaze, then drizzle with the wasabi mayonnaise. Tip: You can serve the tuna chilled for a fresher effect.
Sprinkle chopped green onions and black sesame seeds on top. This adds a visual appeal and a pleasant contrast in flavor and texture.
Serve immediately! These bao buns are best enjoyed when the dough is soft and warm, and the tuna is lukewarm or slightly chilled. Pair with a glass of cold green tea or sake.
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