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1
Whisk together soy sauce, mirin, sesame oil, rice vinegar, minced garlic, minced ginger, white pepper, salt, and sugar; fold in onion and green onion.
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2
Layer beef slices in non-reactive container; pour marinade over, separating layers gently; cover and refrigerate minimum 4 hours, up to 24 hours.
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3
Remove bulgogi from refrigerator 15 minutes before cooking; bring to room temperature.
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4
Heat heavy skillet or grill pan to high heat until smoking; working in batches, arrange beef slices in single layer (do not overlap).
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5
Sear 1–2 minutes per side without moving (allow caramelization); transfer to platter as each batch finishes.
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6
Pour any remaining marinade into hot pan and reduce 30 seconds; drizzle over beef; garnish with sesame seeds and serve immediately with rice and banchan.