Dissolve your cornstarch in 2 to 3 tablespoons of water and add to the mix. Whisk together until it's thickened. Salt to taste and set aside. You will need a bit of hot water right before adding the chicken to make it easier to mix.
For the Chicken
Chop your chicken in small bite-size bits.
Whisk the egg, soy sauce and Chinese wine vinegar and add the chicken to the bowl. Let marinate for 15 to 20 minutes.
Once it's done, sprinkle plenty of cornstarch on a tray and press each piece of chicken until completely coated.
Heat the oil in a wok or high pan or skillet over high heat and cook the chicken in batches until golden brown (approx. 5 to 7 minutes).
Take them off and let them drain over some paper towels to avoid the chicken being too oily.
For The Rice
Rinse your rice until water runs clear and add to a pot with the 1 1/2 cup of water. Bring to a boil over high heat.
Reduce heat to a minimum, cover, and let the rice cook for 12 to 15 minutes.
When ready, fluff with a fork and let it steam covered.
Putting All Together
Add some hot water to your lemon sauce to make it softer and toss the chicken in the pan, making sure it's all well coated.
Plate your rice first, add the well-coated chicken, and garnish with toasted sesame seeds and spring onions. Add a bit of sriracha or soy sauce too if you feel like it.