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1
Combine the flour, dashi, and beaten eggs in a bowl. Whisk until smooth. Fold in the grated yamato-imo. The batter must be thin enough to flow freely when the bowl is tilted — a consistency closer to crêpe batter than pancake batter. Too thick a batter will prevent clean sphere formation during rotation; too thin will produce shells too fragile to hold their shape.
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2
Set the takoyaki plate over a gas burner and heat until the plate reaches a surface temperature of at least 200 °C. Using a brush, apply neutral oil to each hemispherical cup individually, ensuring full coverage of the curved walls. Insufficient pre-heating is the primary cause of batter tearing during rotation. The plate is ready when a drop of batter sizzles and sets on contact within two seconds.
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3
Fill each cup approximately halfway with batter. Place one cube of octopus, a pinch of pickled ginger, and a pinch of tenkasu into each cup. Pour additional batter over the top, filling each cup to slightly above the rim so batter flows between the cups. This two-stage fill is essential: the first layer sets a base on which the filling rests, and the overflow becomes the material that is drawn around to close the sphere during rotation.
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4
When the edges of each cup show a matte, set ring of batter — approximately 60 to 90 seconds after filling — insert two picks simultaneously at the 3 o'clock and 9 o'clock positions of a single ball and rotate together 90 degrees in one motion. The overflowing batter folds down and around the forming sphere. Repeat this quarter-turn rotation every 30 to 40 seconds, working across all cups in sequence, until each ball is sealed, fully spherical, and rotating freely in its cup. This is where the dish lives or dies: a pick inserted alone, a hesitant rotation, or batter touched before the initial ring has set will tear the shell and prevent sphere formation.
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5
Continue rotating the spheres, maintaining even heat beneath the plate, until the exterior of each ball is golden brown and sounds hollow when tapped lightly with the flat of a pick. The interior must remain liquid — toro-toro — not bounced back by a set centre. A fully firm interior indicates overcooking or excessively thick batter.
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6
Transfer the takoyaki to a tray or boat. Allow 30 seconds for a slight skin to form on the exterior before dressing. Brush or drizzle okonomiyaki sauce over the balls, then apply Japanese mayonnaise in parallel lines. Scatter aonori powder evenly, then lay katsuobushi flakes over the top. The residual heat of the balls will animate the katsuobushi immediately on contact.