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1
Ensure the dashi is fully cold. Beat the eggs with the dashi, mirin, sugar, and light soy sauce in a bowl, stirring with chopsticks or a fork in a cutting motion rather than a whisking motion — the mixture should be fully combined but carry no visible foam or bubbles. Pass through a fine sieve if bubbles remain. The mixture should fall from a spoon in one unbroken, lightly viscous stream.
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2
Set the rectangular tamagoyaki-ki over medium heat. Brush the entire interior surface with a thin film of neutral oil, including the corners. Hold the back of your hand 5–6 cm above the pan surface — the heat should be felt as steady and even but not aggressive. A drop of egg mixture placed at the pan edge should set within two to three seconds without browning immediately.
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3
Pour a thin first layer of egg mixture — enough only to coat the pan bottom when tilted — and allow it to set to approximately 80% across the surface: the top should appear just matte and barely tacite to the eye, not fully dry. This first layer is where the dish lives or dies: too thick and the initial cylinder is too loose to receive subsequent layers; too fully set and the layers will not bond. Using chopsticks or a spatula, roll the set layer away from you to the far end of the pan in a tight cylinder.
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4
Brush the now-empty portion of the pan with oil, then pour the second layer of egg mixture beneath and around the existing cylinder, tilting the pan so the liquid egg flows under the roll as well as across the base. Allow this layer to reach 80% set — matte surface, no liquid pooling — then roll the cylinder back toward you, incorporating the new layer. The roll should increase in diameter evenly; no tearing or cracking at the seam indicates correct temperature and layer thickness.
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5
Repeat the oiling, pouring, partial setting, and rolling sequence until all egg mixture is incorporated. Each successive pour should be just sufficient to cover the pan base. The completed tamagoyaki log should be plump, evenly cylindrical or rectangular in cross-section, and golden-yellow on its exterior — no dark or scorched patches, no exposed tears.
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6
Transfer the hot tamagoyaki immediately onto a bamboo rolling mat (makisu). Press and form it into a compact rectangular log, folding the mat firmly around it and applying light even pressure along the length. Hold for two to three minutes. The omelette sets its final shape while still malleable from residual heat; once cold, the shape is permanent and pressing has no further effect.
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7
Unwrap and slice the log into rounds approximately 2–3 cm thick. Each slice should reveal clean, distinct striations of layered egg — a moist, cohesive cross-section that holds its shape without bulging or weeping liquid. The interior should be soft but not wet to the touch of a finger pressed gently against the cut face.