Combine chicken and water in a large saucepan. Bring to a boil; cover, reduce heat, and simmer 20 minutes or until chicken is done.
Remove chicken from broth; discard broth.
Cut chicken into thin slices; place slices in a shallow dish.
Heat oil over medium-high heat in a nonstick skillet coated with cooking spray.
Add chopped green onions and ginger; saut 30 seconds.
Remove from heat, and spoon over chicken.
Add sweetener, sherry, and soy sauce to pan; bring to a boil. Boil 1 minute.
Pour soy sauce mixture over chicken. Cover and chill thoroughly. If desired, spoon chicken mixture evenly onto individual lettuce-lined salad plates, and garnish with green onions.