In a stockpot, combine wings, carrots, potato, celery, tomato, onion, 1 Tbsp. salt, pepper and water. Bring to a boil. Reduce heat; cover and simmer for 1 hour or until chicken and vegetables are tender. , Meanwhile, for the meatballs, combine egg, bread crumbs, parsley, garlic, cheese and the remaining salt in a large bowl. Crumble beef into mixture and mix lightly but thoroughly. Shape into marble-sized balls., Remove chicken meat from bones and cut into bite-sized pieces. Discard bones. Return chicken to the pot. Add meatballs and escarole; cook until meatballs are no longer pink, about 10 minutes longer.