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1
Combine 2 tablespoons salt and about a cup of warm water in a large bowl and add the chicken. Cover with cold water and add a tray of ice cubes. Chill for a few hours.
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2
Make sauce by combining garlic, ginger, gojujang, soy sauce, sesame oil, honey and vinegar in bowl and whisking together.
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3
Heat oven to 400 degrees. Put the butter in a roasting pan big enough to fit the chicken and put in oven.
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4
Remove the chicken from water and pat dry with paper towels. Add flour to plastic bag with remaining salt and some black pepper. Add the chicken pieces one at a time and shake them until thoroughly coated. Remove from bag, shaking vigorously to remove excess flour (do not skip this step).
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5
Put chicken pieces in roasting pan skin-side down and cook without flipping until skin gets crispy, at least 30 minutes and possibly longer. Then remove pan from oven and remove chicken to paper-towel lined plate. Drain pan of grease.
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6
Cover chicken with sauce. Return chicken to pan, now skin side up, and return pan to oven. Cook until chicken is done, not much longer, probably not more than 10 minutes. Serve.