Dice the onion, chop the garlic and chop the chilli pepper and sauté together in a saucepan with oil. Grate the zucchini, peel and dice the potatoes, add and sauté for approx. 5 - 10 minutes. Add curry powder or paste to taste. Add the vegetable stock and simmer for 25-30 minutes, stirring occasionally. Add the parsley and a little coriander.
When everything is soft, puree the soup in a blender. Return to the saucepan, stir in the coconut milk and let it get hot. Season to taste with curry, cayenne pepper, salt and pepper.