Cut the chicken into pieces. Rinse. Fill with water, bring to a boil, cook until tender.
Separate the meat from the bones.
Pour the broth into a separate saucepan.
Finely chop the vegetables.
Peel tomatoes in their own juice, chop them.
Fry the onion, pepper and celery in a frying pan.
Add fried vegetables, chicken pieces, peeled tomatoes in their own juice to the chicken broth (or water, if you want the soup to be less saturated), bring to a boil, reduce the heat.