Peel and chop the pumpkin into 1.5 cm chunks (see video link in the notes above for guidance if required). Peel and chop the onion, and wash and cut the potato into 1cm cubes.
Heat the oil in a pan over a medium heat, and fry the onion for 7-8 minutes until soft and starting to caramelise.
1 tbsp olive oil, 1 onion
Add the potato and stir over the heat for a couple of minutes.
200 g potato
Add the prepared pumpkin, stock, nutmeg and seasoning. Bring to the boil, cover and simmer for 15-20 minutes until the vegetables are soft.
1-1.2 kg whole pumpkin, 600 ml veg or chicken stock, grating of nutmeg, salt and pepper to taste
Remove from the heat, and blitz until smooth. I use an immersion blender, but you could use a food processor if you prefer. Take care to avoid splashing hot soup!
Taste and adjust the seasoning if necessary.
Notes
If you are using part of an enormous Halloween pumpkin, it may be more watery than a denser culinary pumpkin. Cut the stock in the recipe down to 250ml. You can always add more stock to thin the soup later if needed. Taste for seasoning - you may need a little extra if the pumpkin is watery.
Vary the spices to suit. Why not try a generous pinch of ginger, ground cinnamon and/or cardamom?
If you'd like an Asian inspired pumpkin soup, try using a can of coconut milk instead of stock, along with a generous pinch of ground cumin, coriander and ginger.