finly diced celery. Reserve, refrigerated in small mixing bowl. To serve, ladle soup into chilled individual bowls. Sprinkle with the chopped vegetables and croutons, if using. Note: If this is just for the family, I toss all of the diced vegetables right into the soup as it's chilling (it doesn't last long enough for the veggies to get limp). And I might go to the trouble of making croutons, or maybe not.