1. In a medium pot, combine orange juice, sugar, vinegar, soy sauce, ginger, garlic, and red chili flakes. Heat for 3 minutes.
2. Whisk 1 Tablespoon of cornstarch with 2 Tablespoons of water to form a paste. Add to the orange sauce and whisk together. Cook for 5 minutes until thickened, then stir in orange zest.
3. In a shallow dish, mix flour and cornstarch with a pinch of salt. In another dish, whisk eggs.
4. Dip chicken pieces in egg mixture, then coat with flour mixture. Fry in hot oil (350°F) in batches until golden brown, about 2-3 minutes per batch. Drain on paper towels.
5. Toss fried chicken with orange sauce. Serve with green onions and orange zest. Reserve some sauce for rice if desired.
Notes
For a balanced meal, serve with steamed vegetables or rice.