Get the Pumpkin Ready:Peel the pumpkin and remove the seeds. Cut it into 1-inch cubes.
Roast the Pumpkin:Put the pumpkin cubes on a baking sheet. Add olive oil, salt, pepper, and a few sprigs of sage. Bake at 350°F (180°C) for about 10-15 minutes, until soft.
Make Pumpkin Purée:Blend the roasted pumpkin until smooth and set aside.
Toast the Rice:Melt a tablespoon of butter in a pan. Add the rice and toast it for a few minutes.
Cook the Risotto:Add warm broth little by little, so the rice stays covered by about an inch of liquid. Stir often. After 5 minutes, mix in the pumpkin purée.
Add the Final Touch:After 18-20 minutes of cooking, turn off the heat. Stir in grated Parmesan and another spoon of butter to make it creamy.
Enjoy:Serve hot and garnish with sage if you like!