For the cider soup, finely chop the spring onion, peel the potatoes and slice them together with the leek.
Melt butter in a high saucepan, add spring onion, sauté until light and dust with flour. Roast everything briefly and pour in the cider, let it reduce a little.
Then add vegetable stock and bring to a boil. Add potatoes and leek and cook for about 10 minutes. Stir in crème fraîche and reduce the soup to a creamy consistency.
Season to taste with salt, freshly ground pepper and nutmeg. Shortly before serving, froth the soup with a blender and some milk, pour into warmed soup plates and decorate with freshly chopped herbs and flowers (can also be dried flowers).