Slice chicken in 2 inch pieces.
In a bowl, add sliced chicken, sake (optional), low sodium soy sauce, dark soy sauce, oyster sauce, black pepper and corn starch. Mix together.
Heat pan on medium heat. Once hot, add some neutral oil. Then, add chicken in the pan.
Cook chicken for 3 to 4 minutes on one side until golden. Then, flip over and pan fry the other side for 2-3 minutes.
Add chopped garlic and sliced onion in the pan. Stir fry for one minute.
Then, add sugar and sliced lemon. Give it a stir.
Turn off heat and add your chopped Thai chili (optional) and chopped cilantro. Mix together.
Serve with rice and enjoy while the chicken is hot!