Follow these detailed instructions to create your perfect Orange Chicken:

1. Prepare the Chicken: Season the bite-sized chicken pieces with salt and black pepper.
2. Coat the Chicken: In a bowl, combine the flour and cornstarch. Dip each piece of chicken into the beaten egg, then coat it in the flour-cornstarch mixture thoroughly.
3. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat until shimmering.
4. Fry the Chicken: Carefully add the coated chicken pieces to the hot oil in batches. Fry for about 5-7 minutes until golden brown and cooked through. Remove and drain on paper towels.
5. Make the Sauce: In the same skillet, reduce the heat to medium. Add ginger, garlic, and orange zest, stirring for about 1 minute until fragrant.
6. Combine Ingredients: Stir in the soy sauce, fresh orange juice, sugar, and rice vinegar. Bring the mixture to a gentle boil.
7. Thicken the Sauce: Add the cornstarch slurry to the sauce, stirring constantly until thickened (about 1-2 minutes).
8. Toss the Chicken: Once the sauce is at the desired thickness, add the fried chicken back into the skillet. Toss well to coat each piece evenly.
9. Serve Immediately: Once the chicken is coated and heated through, remove from heat.