Cut chicken thighs into small pieces for one bite.
Put all the ingredients for the sauce in a bowl and mix until smooth with a fork.
Dip the chicken pieces in starch.
Heat a frying pan with vegetable oil, put the prepared chicken in a single layer. Fry until golden brown over high heat.
Transfer the chicken to an auxiliary plate: place pepper flakes, pressed garlic, and grated ginger in the pan. Cook for half a minute.
Pour in the sauce and bring it to a boil. The mixture will noticeably thicken. Add the chicken and stir vigorously so that each piece is soaked in the sauce. Heat the dish for a minute and serve immediately with the onion and sesame seeds.