In a medium bowl, combine 1 tablespoon soy sauce with sherry, egg white, salt and ½ teaspoon cornstarch; blend thoroughly. Cut chicken into ¼ inch cubes and toss in marinade to coat. Set aside to marinate for 30 minutes (and up to several hours in the refrigerator).
Combine broth and remaining soy sauce and cornstarch in a small bowl. Mix well and set aside.
Heat wok or large fry pan to medium heat and add oil. Drain chicken marinade. Fry chicken just until firm, about 45 seconds. Remove and drain on paper towels.
Remove all but 1 tablespoon oil from pan. Increase heat to medium high. Add ginger and stir fry until fragrant. Add celery and water chestnuts. Stir fry 1 minute; add chicken and cashews and cook until chicken is done, about 2 minutes more. Stir broth to dissolve cornstarch, and add to pan. Cook over high heat until sauce thickens.
Serve on top of hot cooked rice.
Notes
If you are preparing this recipe as gluten-free, just be sure to use brands of soy sauce and chicken broth that are known to be GF.