Combine ingredients for the orange sauce and leave aside.
Lightly season the chicken with salt, then uniformly cover it with corn starch and put it aside.
One teaspoon of sesame oil, half of the chicken, and a wok heated over high heat are added. Cook until well browned, 2 to 3 minutes per side. Then, set aside.
Cook the chicken for a further two to three minutes on each side after adding one teaspoon of oil. Along with the remaining chicken, set aside.
Add the last teaspoon of oil and briskly stir-fry the ginger and minced garlic for approximately a minute, or until fragrant.
Add the orange zest then return the chicken to the pan.
Stir the chicken quickly, then pour in the orange sauce and heat for one to two minutes, or until the sauce thickens.
Distribute into four dishes and adorn with the sesame seeds and onion.