Bring Chicken to room temp. (Very important)
With fork, on skin side, poke holes in Chicken all over
Mix Sake and Soy Sauce in dish just big enough to hold the Chicken
Cut Chicken in half and coat with Sake/Soy mix, give Chicken time to soak in all in.
Heat oil for frying, I use a wooden chopstick to see if the oil is hot enough, if it bubbles at the end in the Oil, it's ready!
Coat Chicken with starch and fry, about 5-10 minutes,
Slice Leek fine and saute in Oil, not too long, you still want some crunch
Mix Soy Sauce, Sake, Sugar & Vinegar.
Turn off heat and add sauce to Leek
Add Red Pepper
Slice Chicken and dress with Leek Sauce