In a pot, to medium heat, put some oil, the pumpkin, carrot, potato, onion and garlic. Cook by stiring and for all to turn golden a little for about 5 minutes.
Now pour water, needed amount and let it all cook. To make sure it is all well cooked use a fork or knife. The vegetables have to be soft inside.
Pour the vegetables and water in a blender and blend until you get a smooth mixture.
Pour the cream in the pot again and cook until it boils, stiring non stop. While this cooks, add salt, black pepper and nutmeg. Once it has boiled, serve while still hot.