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1
Prepare tare: combine soy sauce, mirin, sake, sugar, garlic, and ginger in a saucepan; simmer 3 minutes until glossy, set aside.
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2
Thread chicken pieces onto soaked skewers, 4–5 pieces per skewer.
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3
Heat binchōtan charcoal grill to high (target 300°C surface).
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4
Grill skewers 90 seconds per side until surface chars; brush with tare on final 30 seconds of each side.
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5
Rest 2 minutes; season with sea salt and black pepper.
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6
Serve immediately with reserved warm tare for dipping.