Toss the chicken thighs with the quarter cup of cornstarch and let sit while you mix the sauce ingredients.
Add the rice vinegar, soy sauce, hoisin sauce, water, sugar and tablespoon of cornstarch in a small bowl and whisk together.
Add the chicken to a pan with the oil and fry until crispy.
Remove chicken from the pan and drain all but a tablespoon of the oil. Next, add in the chili flakes, ginger and garlic.
Cook the aromatics until fragrant (about 30 seconds).
Add in the chicken and toss, then add in the sauce.
Stir for about 30 seconds, or until thickened.
Serve immediately over rice or noodles.
