4 servings (serving size: about 1 cup)
Heat oil in a large nonstick skillet over medium-high heat. Add garlic, ginger, red pepper, and chicken to pan; sauté 5 minutes or until chicken is done. Remove chicken mixture from pan; set aside.
Add onion, celery, and bell pepper to pan, and sauté 4 minutes or until crisp-tender. Drain pineapple, reserving 1/2 cup juice. Add 1 cup pineapple chunks to pan; cook 30 seconds. Reserve remaining pineapple for another use. Combine the reserved 1/2 cup juice, soy sauce, sherry, cornstarch, and sugar in a bowl, stirring with a whisk until smooth.
Return chicken mixture to pan. Stir in juice mixture; bring to boil. Cook 1 minute. Sprinkle with cashews.