Rinse the chicken and dice it into small cubes. Then, pat dry. Preheat the oil to 340 degrees in a large skillet or deep fryer.
Whisk the cornstarch, flour, tamari sauce, seasonings, egg, sesame oil, and water in a medium bowl.
Add the chicken pieces and stir to coat well.
Fry the chicken in small batches in the hot oil for 4 to 7 minutes until cooked through and golden, transferring the chicken to a wire rack with paper towels underneath it as you go.
Place the chicken back into the oil and fry for another minute until you achieve a golden color and extra crispy coating.
Sauce
While the chicken is cooking, whisk the orange juice and zest, tamari sauce, rice vinegar, brown sugar, minced chili garlic, sesame oil, and ground ginger in a large measuring cup.
Add the mixture to a large wok or pan over medium heat. Then, mix the cornstarch and water and add it to the pan. Cook for a minute until thickened.
When the sauce has thickened, remove it from the heat and mix in the chicken pieces until evenly coated.
Notes
Storage
Refrigerate leftovers for up to 3 days in an airtight container.
For longer storage, freeze the chicken for up to 3 months in an airtight, freezer-safe container.
To reheat, defrost the chicken overnight if frozen. Then, microwave at 1-minute intervals until heated through.
Tips
The key to crispy fried food is oil temperature. Preheat your oil and dip a piece of coated chicken in it when you think it's ready. If the coating sizzles, it's ready to go.
Work in small batches to keep the oil hot.
When washing chicken, hold it as close to the bottom of the sink as possible and use a gentle stream of water to reduce or eliminate splashing.