1 ½poundsskinless, boneless chicken thighs, cut into 1 ½-inch pieces
1teaspoonsalt
1teaspoonwhite sugar
1pinchwhite pepper
1cupcornstarch
Sauce:
2tablespoonsvegetable oil
3tablespoonschopped green onion
1clovegarlic, minced
6dried whole red chilies
1striporange zest
½cupwhite sugar
¼cupsoy sauce
3tablespoonschicken broth
2tablespoonspeanut oil
1tablespoonrice vinegar
2teaspoonssesame oil
¼teaspoonground ginger
2teaspoonscornstarch
¼cupwater
Preparation
Heat vegetable oil in a deep fryer or large saucepan to 375 degrees F (190 degrees C).
Whisk egg in large mixing bowl. Add chicken, salt, sugar, and pepper; mix well. Mix in cornstarch, a little bit at a time, until chicken is well coated.
Working in batches, carefully drop one piece of chicken at a time into the hot oil. Fry until chicken turns golden brown and begins to float, about 3 minutes. Remove chicken to a plate and allow to cool as you fry the next batch.
Once all of the chicken has been fried, refry the chicken, starting with the batch that was cooked first. Fry each batch until chicken turns deep golden brown, about 2 minutes more. Drain on a paper towel-lined plate.
To make the sauce: Heat vegetable oil in a wok or large skillet over high heat. Stir in green onion, garlic, whole chiles, and orange zest. Cook and stir until garlic turns golden and chiles brighten, 1 to 2 minutes.
Add sugar, soy sauce, chicken broth, peanut oil, rice vinegar, sesame oil, and ginger; bring to a boil and cook for 3 minutes. Whisk 2 teaspoons of cornstarch in water until dissolved. Stir into the boiling sauce. Return to a boil and cook until the sauce thickens and is no longer cloudy from the cornstarch, about 1 minute.
Add sugar, soy sauce, chicken broth, peanut oil, rice vinegar, sesame oil, and ginger; bring to a boil and cook for 3 minutes. Whisk 2 teaspoons of cornstarch in water until dissolved. Stir into the boiling sauce. Return to a boil and cook until the sauce thickens and is no longer cloudy from the cornstarch, about 1 minute.