Add onion, carrots, garlic, bullion, salt, poultry seasoning and barley to water in a saucepan. Bring to a boil and simmer for 25 to 30 minutes. Stir in the zucchini, egg whites and barbecue sauce. Remove seeds from pepper halves and place the peppers in a steamer or microwave. Steam for 5 minutes. Fill halves with the barley mixture and bake at 350/ for 40 minutes or until the filling is firm. Add more barbecue sauce, if desired. 1 pepper half is approximately 130 calories without added sauce.