Generously season the chicken with salt and pepper. In a large frying pan, heat 2 tbsp sesame oil in a skillet over medium heat. Add the chicken and sauté for 10 minutes, until browned and nearly cooked through.
Once the chicken is cooked remove it from the pan put it in a separate bowl.
Quickly fry the garlic and ginger for 30 seconds, add in the star anise, fennel seeds or Chnese 5 spice and then pour the entire citrus sauce into the same pan you cooked the chicken in.
Bring the citrus sauce to a boil for 5 - 10 minutes, stirring gently until it starts to thicken. (You will know it has thickened when the sauce pulls away from the sides of the saucepan)
Serve sprinkled with sesame seeds over rice alongside the rice.