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1
Combine eggs with the seasoning for the chosen style — dashi, sugar (where applicable), mirin (sushi tamago only), and salt. Add dashi at room temperature; cold dashi does not integrate homogeneously with egg. Beat until fully combined but do not aerate excessively. The mixture should be uniform in colour and viscosity.
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2
Heat the rectangular tamagoyaki-ki over medium-low heat. Apply a thin film of neutral oil using a folded paper towel — this is done between rolls, not before each individual layer. The pan is ready when a drop of egg mixture sets on contact without spitting or browning.
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3
Pour only enough egg mixture to coat the pan in a single thin layer — a thick pour prevents clean rolling and produces an uneven spiral cross-section. Tilt the pan to distribute evenly. This is where the dish lives or dies: the layer must be set enough at its surface not to stick to the next pour, yet soft enough at its core that it rolls without cracking. Watch for the surface to lose its wet sheen and turn just opaque — do not allow it to colour.
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4
Using chopsticks, roll the set layer away from you toward the far end of the pan. Return the roll to the near end. Apply oil with the paper towel to the now-empty portion of the pan. Pour a second thin layer of egg mixture, lifting the existing roll so the raw egg flows beneath it. When the new layer is set to the same pale, just-opaque standard, roll again — always away from you — incorporating the first roll. Repeat until all egg mixture is used. Each finished layer should be pale yellow; browning between layers indicates heat is too high.
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5
Remove the finished roll from the pan immediately. Place it on a bamboo mat and press gently into a cylindrical form. Without this step, the cylinder loosens as it cools and loses its cross-sectional shape. Hold the mat-wrapped roll for one to two minutes. The roll should feel uniformly firm and springy under gentle pressure.
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6
Unwrap and slice crosswise into portions approximately 2–3 cm thick. The cut face should reveal a clean, even spiral of pale layers. For Osaka dashimaki — where the dashi-to-egg ratio approaches 1:1 — the texture will be almost custardy; serve within 15 minutes of making, before the dashi begins to weep. For sushi tamago, the block may be pressed against sushi rice and bound with a nori strip.