I am showing the legit way to make this dish at home. You will need to deep-fry the chicken so that it stays juicy and forms a light coating around the outside. The homemade black pepper sauce is very, very tasty.
In a medium bowl, combine all the chicken marinade ingredients and let it marinate for at least 40 minutes.
In a small bowl, combine all the sauce ingredients. Set aside.
Now, it is time to "velvet" the chicken. You can either do this in hot oil or a pot of boiling water. I prefer oil because it tastes better. See the blog post for pictures. Heat about 1 inch of oil to 350℉. Add ½ the chicken then use a metal spider to quickly separate the pieces. Cook for about 1 ½ minutes until the chicken is opaque and 90% cooked. Remove the chicken and repeat with the remaining chicken.
Heat a wok of medium until it is lightly smoking. Add the oil and swirl it around the base of the wok. Add the garlic and onions and cook for 1 minute. Add the green peppers and cook for another minute.
Increase the heat to medium-high. Add the velveted chicken and cook for another 2 minutes. Give the sauce mixture a quick stir then add it to the wok. Cook and toss everything for 1 minute until the sauce is thickened. Enjoy!