Cut the spring onions in half lengthwise and 3 inches long. Mix with sprouts and prawns. In a bowl mix flour, water and 1tsp of salt. Add prawns and vegetables and mix well. Add 1/4 on the mixture (or less than that, the thiner the crispier) in a hot 28cm non stick pan with oil over medium heat. Fry until golden then flip it and cover with a lid. Cook for 3 min and serve. Mix all the remaining ingredients for dipping sauce. serves 6 serves 6