In a saucepan, whisk to combine all ingredients then simmer until thickened.
Add more water if needed and adjust flavor to taste with sugar, vinegar, soy and chili.
Toss to coat fried pieces of dark chicken meat / boneless thighs (my recipe here).
Serve with rice, chow mein or on top of a fresh salad.
NOTES :
A quicker alternative is to coat cubed chicken with flour or breadcrumbs, pan-fry in oil or butter then cover with sauce. Or use store-bought fried chicken.