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1
Combine the flour, egg, and dashi in a bowl and whisk until the batter is smooth and entirely lump-free. The correct consistency is that of heavy cream: the batter should flow immediately when tilted, not coat the spoon thickly as pancake batter would. Rest the batter at room temperature for 15–30 minutes to allow full flour hydration. The batter is ready when it is smooth, fluid, and uniform.
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2
Simmer the octopus in well-salted water for 3–4 minutes. Remove and allow to cool, then dice into 1–2 cm pieces. Pre-cooking prevents the octopus from releasing excess moisture inside the ball during cooking. The octopus is ready when it is just tender and holds its shape under the knife.
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3
Heat the takoyaki pan — cast iron or electric — until thoroughly hot. Oil every indentation generously; cast iron absorbs oil and any insufficiency will cause the forming spheres to tear on the first turn. The oil is ready when it shimmers visibly in each cup.
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4
Pour the batter into the indentations, filling each to the rim and allowing the batter to overflow slightly across the flat surface between cups. Immediately drop one piece of octopus, a pinch of tenkasu, a pinch of beni shoga, and a pinch of green onion into each cup. This is where the dish lives or dies: wait until the bottom 30–40% of each ball has visibly set — the edge of the batter will have turned from translucent to opaque and will hold its shape — before attempting the first turn. Too early, and the unset batter flows rather than rotates; the sphere cannot form.
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5
Insert a metal pick at the edge of each cup to release the setting ball from the flat surface and rotate it 90 degrees so that the unset batter faces downward into the cup. Allow this new face to set, then continue rotating in successive quarter-turns, gathering the overflowed batter back into the sphere with each rotation, until a complete, uniform sphere has formed. The finished takoyaki is ready when it turns freely in the cup, is golden brown on all surfaces, and sounds hollow when tapped lightly with the pick.
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6
Remove the takoyaki immediately to a plate or tray. Apply the toppings at once, away from the pan: brush or drizzle okonomiyaki sauce over each ball, follow with a zigzag of Kewpie mayonnaise, scatter the katsuobushi flakes, and finish with aonori. The katsuobushi will begin to wave from the residual heat of the balls. The takoyaki is ready to serve when the flakes are in motion and the sauce is glossy.