Chop up pumpkin & sweet potato. Mix up some olive oil, ground pepper & nutmeg, toss pumpkin pieces in the oil to coat thoroughly. Bake pumpkin in a moderate oven for about 40-60 minutes (until really soft).
Roughly chop an onion or 2, coat it in the olive oil (but this time add a little brown sugar to the coating mix as well as the nutmeg). Add it to the oven tray about 15 minutes into cooking the pumpkin.
Heat up some stock in a large pot till it’s simmering. Add the roasted vegetables. Use a hand blender to completely mash down the vegetables & mix until the consistency is right (I start with a little stock & add more if needed). Adjust seasoning if necessary