Chinese Chicken with Black Pepper Sauce

Note: This recipe calls for boneless thigh meat, which is preferred, but I tried using breast meat and the result was fine also.
Mix together sauce ingredients in a small bowl and set aside.
Cut chicken into a small dice, about 1/4-inch.
Heat 1-2 cups peanut or other cooking oil in your wok.
Place cornstarch in a small bowl and begin to dust chicken pieces, shaking off excess.
Fry in hot oil in small batches until crispy and golden, about 2-3 minutes; drain.
Remove oil from wok and discard.
Heat 1 tbsp oil in wok and stir-fry onion about 1 minute; add peas and carrots and cook another 30 seconds.
Add sauce mixture to wok along with chicken pieces and stir to coat everything evenly.
Serve at once with hot steamed rice.