In a small bowl, combine the sauce ingredients and set aside.
Place the chicken in a large bowl. Add the cornflour, salt, pepper and egg and mix using a spoon until the mixture is thick and sticky, coating the chicken evenly.
Heat the oil in a large, heavy-based frying pan over medium heat, and cook the chicken in batches for 3–4 minutes until golden. Set aside on a paper towel to drain.
Wipe the pan clean, reduce the heat to low and add the prepared sauce to the same pan. Cook, stirring, for 2 minutes, or until the sauce has slightly thickened and caramelised. Return the chicken to the pan and toss the chicken in the sauce so that it is evenly coated and glossy.
Divide the rice among four bowls. Top the rice with the chicken and sauce, sprinkle with the spring onion and sesame seeds to garnish and serve immediately!
