Combine chicken slices and soy sauce. Mix well and marinate for at least 15 minutes.
Heat oil. Meanwhile, dredge the chicken strips in 4 1/2 tablespoons of cornstarch.
Put in the coated chicken and fry until color turns light brown. Do not overcook.
Remove the chicken from the pan, place in a plate, and set aside.
Drain excess oil until about 1 tablespoon is left. Saute garlic and put-in the celery leaves.
Pour-in chicken broth and sherry. Add sugar, salt, lemon rind, lemon juice, salt, and pepper. Stir and let boil.
Pour-in the cornstarch diluted in water. Stir until the sauce thickens.
Put-in the fried chicken slices. Stir and cook for another minute.
Transfer to a serving plate. Serve. Share and enjoy!