Quarter and peel the turnip. Cut a quarter into thin slices. Cut the rest into small cubes. Peel and finely dice onion, garlic and ginger. Halve and squeeze oranges
Heat butter in a pot. Sauté the diced turnip, onion and garlic in it. Dust with curry. Pour in broth, coconut milk and orange juice, up to about 2 tbsp. Add ginger and a little salt, bring to the boil, cover and cook for about 20 minutes
In the meantime wash spring onions, dab dry and cut into strips. Peel the prawns, except for the tail fins, and remove the intestines. Wash prawns and pat dry. Heat 2 tablespoons of oil in a frying pan and fry the prawns for 4-5 minutes, turning them over. Remove, season with salt, sprinkle with 2 tbsp. orange juice and keep warm. Heat 2 tablespoons of oil in a frying pan. Fry the turnip slices for approx. 3 minutes while turning, season with salt and remove. Puree the soup and season to taste with salt, pepper and sugar. Serve the soup with prawns and turnip slices. Sprinkle with spring onions