Cut each of the chicken pieces into small sizes (about 2-inch long and 1-inch wide).
Mix the marinade ingredients in a bowl until the sugar has dissolved.
Coat the chicken pieces with the marinade. Marinate for about 30 minutes in the refrigerator.
Preheat a skillet over medium high heat. Add the chicken pieces, reserving the marinade. Cook until cooked through and slightly caramelized, about 2 minutes each side.
In a hot wok, add the vegetable oil and saute the onion for a minute. Add the rest of the vegetables and stir-fry for a minute or two. Season with salt and pepper, or add stir-fry sauce. Add on top of a rice bowl.
Add the cooked chicken to the rice bowl with the stir-fry vegetables. Garnish with chopped green onion and sesame seeds.
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