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1
Combine gochujang, soy sauce, rice vinegar, sesame oil, brown sugar, garlic, and ginger in a bowl; set aside.
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2
Heat vegetable oil in a large cast-iron skillet or wok over high heat until wisps of smoke appear.
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3
Add chicken pieces, sear 4 minutes without stirring until caramelized on one side, then toss and cook 3 minutes more until cooked through (internal temp 72°C).
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4
Pour gochujang sauce over chicken, toss to coat evenly, add sweet potato and scallion, and cook 3 minutes, stirring frequently until potatoes are tender-crisp and sauce clings to ingredients.
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5
Season with black pepper, plate in a cast-iron stone bowl (dolsot) or on a platter, top with toasted cashews and sesame seeds, serve immediately with steamed rice.