Cut the pumpkin, the potato and the onion into medium pieces. We wash them well and leave the skin on the pumpkin and the sweet potato when they are organic.
You can keep the pumpkin seeds to dry them, bake them in the oven for a few minutes, and use them for another preparation.
Put them in a sauce pot, add water to cover your vegetables (not completely but at ¾) and add the spices. Cover and simmer at medium heat for about 30 minutes.
When ready, remove the cinnamon and let the soup cool so you can mix it in the blender (unless you have a hand blender, so you can mix it directly into the pot). Add half a glass of water in case the ingredients cannot melt in the blender.
Serve warm in a bowl and garnish with thin orange peels (optional), a little bit of crushed red pepper, sweet paprika and sesame.