Cut chicken in bite size pieces, about 1 inch (3cm) pieces. Season with salt and freshly ground black pepper.
In a medium bowl whisk together the teriyaki sauce ingredients, soy sauce with sugar, rice vinegar, sesame oil, ginger, garlic and cornstarch. Set aside until ready to use.
In a large skillet, heat oil over medium-high heat. Add chicken pieces and fry until nicely golden on the sides, for about 8 minutes.
Pour the sauce over the chicken and cook for about 3-4 minutes more and the sauce thickens and chicken is cooked through.
Serve teriyaki chicken with your favorite side dish and veggies.
Top chicken with toasted sesame seeds before serving. Enjoy!