For the Hessian celery soup, wash and peel the celery and boil in salted water until tender.
Pass through a sieve or puree with a hand blender and add back to the soup.
Mix the cornstarch with a little cold water, add to the boiling soup, season to taste.
Just before serving, add the finely diced ham and butter to the celery soup.
Preparation Tip:
Hessian celery soup tastes great even without ham.