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1
Combine all yakisoba sauce ingredients — Worcestershire, oyster sauce, soy sauce, sugar, and tomato paste — in a small bowl and stir until the sugar dissolves. Set aside within arm's reach of the cooking surface. The sauce must be ready before cooking begins; there is no time to prepare it once the iron is hot.
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2
If the chukamen noodles are cold and clumped, place them, still in their sealed package, in a microwave for 60 seconds to loosen the strands. The noodles should separate freely when pressed through the package.
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3
Heat a teppan or heavy iron griddle (or the largest, heaviest pan available) over the highest available flame until a drop of water skitters and evaporates on contact. Add a film of oil. Lay the pork belly slices flat in a single layer. Cook, turning once, until the fat renders and the surfaces are fully coloured. The pork must be cooked through at this stage before any vegetables are added.
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4
Add the carrot julienne and the thick cabbage stems to the pork on the hot surface. Stir-fry on high heat, keeping the ingredients moving, until the stems begin to soften and show light colour at the edges.
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5
Add the cabbage leaf sections and the bean sprouts. Continue stir-frying on maximum heat. The leaves should wilt and the sprouts soften slightly but retain a perceptible bite — the vegetable combination is essential for textural variety.
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6
Add the loosened chukamen noodles directly onto the hot iron surface. Spread them across the surface and press lightly so that the noodles make direct contact with the iron. The noodles should sizzle audibly and begin to char lightly on contact. Fold the noodles through the pork and vegetables, turning rather than over-mixing, until heated through and streaked with light colour from the surface — this is where the dish lives or dies: insufficient heat at this stage, or excessive stirring, robs the noodles of their characteristic teppan char and produces a uniform, soft mass instead of the caramelised, smoky strands of authentic yakisoba.
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7
Pour the prepared yakisoba sauce evenly over the noodles and vegetables. Distribute quickly with a spatula, folding rather than working the mixture, for no longer than 60 seconds. The sauce should coat every strand; the moment it is absorbed and fragrant, remove from the heat. Prolonged cooking burns the sauce and produces bitterness.
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8
Divide immediately into four portions. Dust each portion with aonori at the point of service — not during cooking. Arrange beni shōga alongside and finish with katsuobushi. The aonori should be vivid green and fragrant; the beni shōga should provide a sharp acid counterpoint to the sweet-savoury sauce.