Clean and wash spring onions and cut them separately into green and white rings. Peel and chop the celery. Cut the vanilla pod in half lengthwise.
Heat butter in a pot, fry white spring onion rings, vanilla pod and celery for about 3 minutes. Add white wine, juice and 300 ml water. Bring to the boil and simmer for about 15 minutes. Remove vanilla pod, add cream and puree soup. Season soup with salt, nutmeg and pepper. Arrange soup with chips and sprinkle with the rest of spring onions. Sprinkle with oil.