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1
Combine flour, dashi, beaten eggs, light soy sauce, and salt. Whisk until smooth and fully incorporated — the batter is markedly thinner than pancake batter. Rest for 30 minutes at room temperature; gluten relaxation produces a smoother result and reduces rubbery texture in the finished ball.
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2
Set the takoyaki-ki (cast iron hemispherical mold plate) over a high flame. Coat every mold generously with neutral oil. The plate is ready when a drop of batter sizzles and sets on contact — the surface must reach above 200 °C before any batter is poured. Insufficiently heated molds cause the batter to spread rather than dome.
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3
Pour the thin batter into and deliberately across the molds, slightly overfilling so batter bridges between them. Immediately place one piece of boiled octopus, a pinch of tenkasu, a few scallion slices, and a little pickled ginger into each mold. Work quickly — the crust begins forming from the moment batter meets the iron.
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4
This is where the dish lives or dies. When the edges of each ball have set to an opaque crust but the centre remains liquid, use two thin metal picks (kushi) to rotate each ball 90 degrees, folding the semi-liquid batter inward as the crust turns outward. Repeat the quarter-turn three to four times per ball, working across the plate with rhythmic, mechanical precision, until all four quadrants of each ball have hardened into a continuous golden sphere. The speed of turning and the angle of the picks determines whether a seamless sphere or a collapsed mass results. The finished ball should yield a faint hollow sound when tapped and roll freely in its mold.
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5
Continue cooking, rotating occasionally, until the exterior of each ball is uniformly golden and crisp. The interior must remain creamy and liquid at the centre — Osaka style. Press a pick gently into the surface: the crust gives a firm resistance while the core feels molten beneath it. A ball cooked completely solid has failed.
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6
Transfer immediately to a serving tray or boat. Brush with takoyaki sauce, apply Japanese mayonnaise in a zigzag across the surface, scatter aonori, then lay hana katsuobushi over the top. Serve at once — the bonito flakes must still be moving from the retained heat of the balls when they reach the table.