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1
Combine the cold dashi, flour, beaten eggs, and soy sauce in a bowl or pouring jug. Whisk until smooth and fully integrated. The batter is intentionally thin — at 5:1 dashi-to-flour by volume it will flow easily from a jug. A thick batter that coats the whisk heavily is incorrect and will prevent the liquid interior from forming.
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2
Heat the takoyaki iron plate (takoyaki-ki) to high heat. Oil every mold generously with neutral oil using a brush or oil-soaked cloth. The oil must pool slightly in each semi-spherical cavity — insufficient oil causes the batter to bond to the iron, making rotation impossible.
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3
Pour batter from the jug to fill every mold and flood lightly across the surface between them. Immediately place one piece of octopus tentacle in each mold, then distribute green onion, tenkasu, and beni-shōga across all molds. Work quickly — the thin batter begins to set at the base immediately on a properly heated plate.
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4
Wait 90 seconds. The moment the batter at the rim of each mold shows a set, opaque edge — no longer wet-shining — begin the first rotation. This is where the dish lives or dies: rotating too soon tears the unset base and destroys the sphere; waiting too long fixes a misshapen ball that cannot be corrected. Using two metal or bamboo picks, push under each ball and turn it exactly 90 degrees, pulling any loose batter from the plate surface into the exposed cavity as you do so. Every mold on the plate must be rotated before the first ball has time to over-set.
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5
After 60 seconds, perform the second 90-degree rotation with the picks. Tuck any remaining loose batter into the exposed side. The ball is beginning to hold its spherical form. The surface in contact with the iron should show an even golden colour — pale indicates insufficient heat, dark char indicates excess.
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6
After a further 60 seconds, perform the third 90-degree rotation. The original base of the ball is now facing upward. The exterior shell should be audibly crisp when tapped lightly with a pick — a dull sound indicates an insufficiently developed crust.
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7
Make small corrective rotations over the remaining 60–90 seconds to achieve an even sphere. The ball is done when it rotates freely under the pick with no resistance — no batter adhering to the iron — and the entire exterior surface is uniformly golden. Total cooking time across four full rotations: 4–5 minutes. The interior at this stage is toro-toro: flowing, almost molten, not fully set.
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8
Transfer the balls immediately to a serving dish or tray. Apply takoyaki sauce in a broad stripe, Kewpie mayonnaise in a zigzag pattern, aonori dusted evenly over the surface, and katsuobushi scattered on top. The residual heat causes the katsuobushi to move. Serve at once — the toro-toro interior is the defining pleasure and it diminishes as the balls cool.