Mix the marinade together very well, in a medium sized bowl. Slice chicken breast into 1/2 inch pieces and dump into the mixed marinade, and mix evenly. Heat oil in a large skillet, on a medium flame and when hot, drop in the pieces one by one and fry until each side is golden brown.
While that's frying, mix together the sauce ingredients and heat it up in a medium sized sauce pan on a medium flame. If it becomes too thick, keep adding some water until its smooth enough (a half of a cup should suffice.)
Put the fried chicken aside to drain, and throw the thinly sliced chili peppers into the hot oil, (optional-sliced scallion) and fry for 1/2...