In a small mixing bowl, add the Worcestershire sauce, hoisin sauce, honey, shaoxing wine, soy sauce, oyster sauce, and ketchup. Stir to combine. Then add a little black pepper, the Chinese 5 spice, and cornflour. Stir until smooth.
Spray a frying pan and set on a medium heat. Add the chicken and fry for 2 minutes.
Add the garlic, onion, and pepper, and continue to fry for 2 minutes.
Pour in the sauce and fry until thickened (this should take 3-4 minutes).
Serve sprinkled with sesame seeds, spring onion, and your choice of accompaniment.