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1
Break the eggs into a bowl and beat them thoroughly until the whites and yolks are fully combined but without incorporating excess air — the mixture should be uniform in colour. Add the warm ichiban dashi at a ratio of 30–50% of the egg volume (120 ml minimum; up to 200 ml for the most skilled version) and the usukuchi soy. Stir to combine. The mixture will be noticeably thinner than a standard tamagoyaki base. If using mitsuba, add the trimmed stems to the egg mixture now. The mixture is ready when it runs off the chopstick in an even, pale gold stream.
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2
Set a rectangular tamagoyaki pan — preferably copper for its even heat distribution, which is more critical at this high dashi ratio than for standard tamagoyaki — over medium heat. Brush lightly with neutral oil and heat until a drop of egg mixture set on contact without browning. The pan must be consistently hot across its full surface; uneven heat at this dashi level will cause the omelette to tear.
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3
Pour in one-third of the egg mixture — enough to cover the pan base in a thin layer. As it barely begins to set at the edges and bottom but remains visibly liquid at the surface, fold or roll it gently toward the far end of the pan using chopsticks or a spatula. The roll must be handled with particular delicacy: the high dashi ratio renders the structure far more fragile than Tokyo-style tamagoyaki. This is where the dish lives or dies — roll too early and the egg runs apart; too late and the interior sets firm, eliminating the trembling custard quality that defines dashimaki.
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4
Push the formed roll to the far end of the pan. Oil the now-empty near end lightly and pour in the next third of the egg mixture, lifting the existing roll so the fresh egg runs beneath it. When this layer is barely set at the base and still liquid at the surface, roll the existing cylinder back over it, incorporating the new layer. Repeat with the final third. The finished roll will be pale golden-yellow — significantly paler than standard tamagoyaki — and visibly soft, yielding to the gentlest pressure.
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5
Transfer the finished roll immediately to a makisu (bamboo rolling mat) and shape gently into a rectangular form, pressing no harder than is needed to hold the shape. Rest for no more than one minute. Dashimaki collapses and the liquid distributes unevenly as it cools; it is not suitable for advance preparation. Slice crosswise into four even pieces and serve at once, warm. The definitive test: a small amount of liquid dashi should release gently from the cut surface — this indicates correct set with retained liquid pockets within the layers.