Place the flour in a bowl Place the eggs in a second bowl. Lightly beat them.Place the cornstarch in a third bowl.
Coat the chicken pieces in flour, then in egg, and finally in cornstarch.
Stir together the gochujang paste, rice vinegar, brown sugar, soy sauce, and ginger in a bowl. Set aside.
Heat 2 inches of oil in a Dutch oven or a deep sided skillet to 375 degrees F.
Fry the chicken in batches for 3 to 4 minutes, or until crispy and cooked through. Place on a paper towel-lined plate to drain.
Toss chicken with sauce and sprinkle with green onion and sesame seeds.
Notes
Fry the chicken in batches. You don't want to crowd the chicken while it fries or cause the oil temperature to drop too much.Best eaten right away but will keep in the refrigerator for 3 to 4 days.