Place chicken pieces in a bowl and add the grated ginger, fish sauce, and white pepper, and mix. Add beaten egg and mix again. Let it marinate for at least 15 minutes or while you prepare the other ingredients.
1 pound boneless chicken thigh, 1 tablespoon ginger, 1 tablespoon fish sauce, ¼ teaspoon white ground pepper, 1 medium egg
Use a zester and get the zest from 1 orange. Set the orange zest aside for later (cover it so it will not dry out). Now use a squeezer or juicer to get the juice from the same orange, it should be about ½ cup of orange juice.
In a bowl, combine the dry ingredients for the sauce and mix then pour in the wet ingredients except for the orange zest and chili flakes. Mix well until sugar and salt are dissolved. Set aside.
1 tablespoon cornstarch, ¼ cup brown sugar, orange Juice, ¼ cup rice vinegar, ¼ cup water, 2 tablespoon soy sauce, Salt
Add ¼ cup cornstarch to the marinated meat and mix well with your hands or a spatula.
¼ cup cornstarch
Place ½ cup of cornstarch on a plate. Take a piece of meat and roll it with cornstarch to fully cover. Press it inside your hand to make sure the cornstarch sticks firmly to the meat. Do the same to the rest.
½ cup cornstarch for dredging
Heat oil in a wok over medium-low heat. Check if th oil is hot enough by dipping a chopstick, it should bubble immediately.
1-2 cups canola or corn oil for deep frying
Deep fry the meat in batches if needed, do not overcrowd. Do not stir for 1 minute after putting in hot oil so the cornstarch won’t shed off. Fry for 3-4 minutes or until golden brown. Remove the meat from the oil using a spider ladle and place it on an oil-draining rack or plate lined with a paper towel.
Empty the oil from the wok, no need to wipe it clean. Turn on the heat to medium-high. Pour the sauce mixture into the wok and simmer until it has thickened. Add the orange zest and chili flakes. Lower heat to low and continue to simmer until quite thick.
1 orange zest, ½ - 1 teaspoon chili flakes
Add back the fried chicken pieces. Toss and mix for 10 seconds until everything is coated with sauce. Transfer to a serving dish.