Preheat broiler. Wash chicken and wipe dry. Combine bouillon, soy sauce, garlic and salt in a shallow dish. Place chicken in marinade and spread with fingers. Let stand 15 minutes, turning occasionally so that entire surface of chicken gets coated. Broil on rack 4 inches from heat, turning once until done on both sides. While chicken is broiling, prepare the sauce: Stir cornstarch into lemon juice; combine with water and vinegar in a saucepan. Add pineapple, carrot, green pepper and lemon rind. Bring to a boil. Lower heat and simmer until thickened. When chicken is broiled, place on two individual serving plates. Pour Lemon-pineapple sauce over chicken. Serve immediately with a border of shredded lettuce. From Weight Watchers International Cookbook.