Peel and chop the celery and potatoes. Peel and dice the onion. Sauté everything in the melted butter for a few minutes. Pour in the white wine and vegetable stock, add the spices and cook the vegetables until soft.
When everything is really soft, add the cream and, if necessary, add seasoning. Beat the soup with the hand blender until frothy, serve on plates and serve garnished with a little celery or parsley.
Alternatively, omit the cream as a cappuccino. Pour the soup into cappuccino cups, froth the milk, add to the soup and serve dusted with paprika.