In a soup pot, mix together the celery, onion, chicken broth, and water.
Simmer until the celery and onion are tender.
At this point you can put the soup through a sieve if you want a creamy soup, but it’s not necessary, especially if you have finely diced the vegetables.
In a medium saucepan, melt the butter and add the flour, stirring constantly.
Add the milk and continue to stir constantly until the mixture has thickened slightly.
Add to the soup and stir to mix well.
Add the cream and salt and pepper to taste, and heat soup until hot but not boiling.
Some folks believe that celery is an excellent nerve tonic, so this might be the perfect soup to have on an especially hectic day.