Drain pineapple, reserving juice. Stir together pineapple juice, sugar and next 6 ingredients.
Cook juice mixture in a large skillet or wok over high heat, stirring constantly, 15 to 30 seconds or until thickened. Add cubed bell pepper and cook 3 to 4 minutes. Add pineapple chunks and chicken. Cover and cook, stirring often, for 10 minutes or until chicken is done. Serve over Lemon Rice Pilaf, if desired.