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1
Season the rectangular tamagoyaki pan over medium heat. Brush lightly with oil and heat until a drop of egg mixture sets on contact but does not brown or spit. The pan must hold this temperature throughout cooking; adjust as needed.
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2
For dashimaki tamago: combine the beaten eggs with 100 ml dashi, light soy, and mirin. The mixture will be markedly loose — almost more liquid than egg. For tamagoyaki: combine the beaten eggs with sugar, soy, and mirin. No liquid is added; the mixture is thick and distinctly sweet. Keep the two preparations separate.
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3
Pour a thin layer of the egg mixture into the pan — enough to coat the base. This is where the dish lives or dies: the layer must be rolled the instant the surface turns from wet-glossy to just-set with a trace of moisture still visible. A fully cooked layer will not bond to the next; an under-set layer will collapse. Roll the layer decisively toward the far end of the pan using ohashi or a spatula — one confident motion, not a hesitant nudge.
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4
Push the rolled egg to the far end of the pan. Brush the exposed surface lightly with oil. Pour another thin layer of egg mixture, lifting the existing roll briefly so the new liquid runs beneath it. Wait again for the surface to reach just-set with residual gloss, then roll back toward yourself, incorporating the previous roll. The layers should bond into a single log.
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5
Repeat the layering and rolling process until the egg mixture is exhausted. The finished roll should be a compact, even log filling the width of the pan. It should feel firm enough to hold its shape but yield gently to the touch — for dashimaki, it will feel softer and more yielding than tamagoyaki.
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6
Turn the finished roll onto a cutting board. The definitive test for dashimaki tamago: the roll should jiggle slightly when released — a visible tremor that confirms correct dashi proportion and a just-set interior. Tamagoyaki will be stable and hold firm. Allow the roll to rest briefly, then cut into slices of approximately 2–3 cm to reveal the distinct layered cross-section.