Start by making the sauce. In a large saucepan add the brown sugar, orange juice, tamari, vinegar, sea salt, orange zest, granulated garlic, ground ginger, and red chili flakes. Heat for about 4 minutes.
In a separate bowl whisk together the water and tapioca starch. Add the water and starch mixture to the saucepan. Bring to a boil and then reduce the heat to simmer and cook 15-20 minutes, stirring once a minute.
While the sauce is cooking, fry the chicken.
Add the oil to a skillet and heat on medium heat. In 2 shallow bowls add the tapioca starch with the gluten free all purpose flour (whisk it together) to one and the beaten eggs to the other.
Dip the chicken pieces into the eggs and then the starch/flour mixture, coating all sides.
Place the chicken into the hot oil and fry about 4 minutes on each side. Once they are done place the cooked pieces on a plate lined with paper towels.
Once the sauce is done, pour it over the chicken, or even add the chicken to the pan with the sauce if it is large enough and toss the chicken into the sauce.
Garnish with the green onions.