Clean, peel, wash and roughly cut the carrots. Clean and wash spring onions. Chop the white of the onions, cut the green into fine rings. Peel and finely chop the ginger.
Heat the butter in a large pot. Fry carrots, chopped onions and ginger for about 10 minutes. Sprinkle with curry and flour and sauté briefly. Stir in orange juice and stock. Bring to the boil, cover and simmer for about 20 minutes.
Finely puree the soup with a hand blender. Stir in cream and heat up. Season to taste with salt, pepper and 1 pinch of sugar. Stir in spring onion green before serving.