Clean and roughly cut cauliflower, broccoli, onion, carrot and potato, put everything in a saucepan and add the stock. Bring to the boil and season with salt, pepper, chilli and nutmeg. Cook on a low heat until the vegetables are soft.
Puree finely in a blender and then add the crème fraîche and parsley. Season to taste again before serving and serve with croutons roasted in a little butter.