Wash and peel the asparagus and cut off the woody ends. Boil the asparagus skins and ends with a good 1⁄2 l water. Simmer open for about 10 minutes.
In the meantime cut the asparagus into pieces. Clean and wash spring onions and cut into rings. Clean chillies, cut lengthwise, remove seeds, wash and chop finely. Drain the asparagus peel into a fine sieve, catching the stock.
Heat the oil in the pot. Sauté the asparagus, spring onions and chilli in it. Sprinkle with curry and sauté. Add asparagus stock and coconut milk and bring to the boil. Season with salt and pepper. Cover and simmer for about 3 minutes. Stir the starch and 1 tbsp. water until smooth, add to the soup and simmer for about 5 minutes. Season to taste with salt, pepper and lime juice (do not boil any more, so that the soup does not settle).