Press the tofu: Drain the tofu and wrap it in a clean kitchen towel. Place a small cutting board and a light weight on top.
Let it press for 15–20 minutes to remove excess moisture.
Cut into cubes: Slice the tofu into 1- to 1.5-inch cubes. Pat dry again to help the coating stick.
Preheat the air fryer: Set it to 375°F (190°C) for 3–5 minutes. A hot basket helps the coating crisp.
Coat the tofu: Add potato starch to a shallow dish.
Lightly dredge each tofu cube, shaking off excess. You want a thin, even layer—not clumps.
Oil and arrange: Lightly spray the air fryer basket. Add tofu in a single layer with a little space between pieces.
Spray the tops of the tofu lightly with oil.
Air fry: Cook at 375°F (190°C) for 10–14 minutes, flipping halfway. Tofu is ready when the exterior is pale golden and crisp.
Make the broth: While tofu cooks, bring dashi to a gentle simmer. Stir in soy sauce, mirin, and sugar.
Taste and adjust salt or sweetness as needed. Keep warm on low heat.
Prep toppings: Grate a small amount of daikon and ginger. Slice green onions thin.
Set out bonito flakes or nori, if using.
Assemble: Divide the hot broth into shallow bowls. Add crispy tofu cubes. Top with grated daikon, ginger, green onions, and a pinch of bonito or nori.
A sprinkle of shichimi adds gentle heat.
Serve immediately: Agedashi tofu is best when the coating is still crisp and the broth is steaming.