In a large bowl, add chicken, kosher salt, egg and flour. Mix thoroughly until chicken pieces are coated. Cover with plastic wrap and let sit in the refrigerator for at least 20 minutes, but no longer than 1 hour. Chicken must sit to room temperature for 30 minutes prior to cooking, so make sure to remove from refrigerator at least 30 minutes prior to coating with flour and cornstarch mixture.
Make the sauce by adding the orange juice, chicken broth, corn starch, ground ginger, soy sauce, white wine vinegar, and sugar to a small bowl or large measuring cup and whisking together. Set aside
In a medium bowl, add flour, corn starch and seasoning or sea salt. Whisk together, and add chicken pieces. Use hand to toss together until all pieces are coated with flour mixture. Press the flour mixture into the chicken pieces to ensure the pieces are thoroughly coated..
In a large skillet or heavy bottom pot, heat oil to 350 degrees. Carefully add a batch of chicken pieces to oil a few pieces at a time. Do not overcrowd. Cook for 3 minutes or until lightly browned. Remove and let rest on a wire rack, or a plate lined with a paper towel.
Allow oil to reach 365 - 375 degrees, then fry in batches again for 1-2 minutes, or until chicken pieces are golden brown and crispy. Let rest on a wire rack or paper towel lined plate.
Heat a wok or nonstick skillet over medium heat, and add 1 tbsp. of oil. St Sir in garlic, crushed red pepper flakes and orange zest. Sauté for 1 minute. Pour in sauce. Bring to a simmer, and simmer for 5-7 minutes. Sauce should thicken and reduce slightly. Taste and add salt if needed.
Toss chicken in sauce until fully coated. Garnish with green onions if you like. Serve immediately with side of choice. White rice is perfect.