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1
Combine the eggs, dashi, soy sauce, sugar, and mirin (if using) in a bowl. Add a drop of neutral oil to the mixture. Whisk until fully homogeneous, then strain through a fine-mesh sieve to remove the chalazae. The mixture should be smooth, uniform, and free of foam. Rest briefly until all surface bubbles subside — the liquid should be still and clear-yellow.
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2
Set a rectangular tamagoyaki pan (makiyakinabe) over medium-low heat. Using a folded paper towel or pastry brush, coat the pan evenly and thoroughly with neutral oil — every corner and edge must be covered. The oil should shimmer and move freely when the pan is tilted, but must not smoke. An insufficiently oiled pan will cause the layer to tear during the rolling phase.
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3
Pour in the first thin layer of egg mixture — enough to cover the base of the pan when tilted. This is the step on which the dish lives or dies: the heat must be low enough that the base sets gently from beneath while the surface remains just barely liquid. If the base sets too fast, the layer will crack on rolling; if the surface sets completely before rolling begins, the layers will not adhere. When the base is opaque and the surface is still wet-glossy at its centre, begin rolling from the far edge toward you using chopsticks or a silicone spatula, pressing lightly to form a compact log.
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4
Push the formed roll to the far end of the pan. Re-oil the exposed pan surface. Pour a second thin layer into the vacated space and tilt the pan so the liquid egg runs beneath the existing roll. When the new layer is set at its base but still wet at the surface, lift the existing roll and roll it forward again over the new layer. The two layers should bond cleanly. Repeat with three to five layers in total until the egg mixture is exhausted. Each finished roll should be compact and the exterior golden with light colour from the sugar; the smell will shift from raw egg to a faint, sweet-savoury caramel note at each pour.
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5
Transfer the finished roll immediately onto a makisu. Roll the bamboo mat firmly around the log and press gently but evenly along its length while the roll is still hot. Hold or bind the mat in place and allow the roll to rest until cooled enough to hold its shape. When the mat is unwrapped, the roll should be distinctly rectangular in cross-section with clean, sharp edges — not round or collapsed.
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6
Slice the cooled roll into portions approximately 2 cm thick with a clean, single-stroke cut. The cross-section should reveal concentric golden layers — the visual record of technique. The texture under light pressure should be soft-springy, neither rubbery nor wet. Taste a trim piece: the sugar-soy-dashi balance should be harmonious, with neither element dominant over the others.