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1
Whisk eggs with mirin, dashi, usukuchi soy sauce, and salt until homogeneous; do not aerate.
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2
Heat rectangular tamagoyaki pan over medium-high heat; lightly oil with damp cloth.
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3
Pour thin layer of egg mixture (about 6 mm); let set for 20 seconds until edges firm.
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4
Roll cooked layer toward far end using wooden spatula; re-oil empty section.
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5
Pour another layer of raw egg under rolled portion; set 20 seconds, roll again.
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6
Repeat steps 4–5 until all egg is incorporated and roll reaches 5 cm diameter.
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7
Transfer to wooden board; let rest 2 minutes, then slice into 2 cm pieces with wet knife.
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8
Arrange on plate; dust with aonori and top with bonito flakes; serve warm or room temperature.