Peel, seed and slice pumpkin. Peel and slice onions. Chop finely chestnuts using an electric mixer.
Add pumpkin, onions, salt and powdered chestnuts in 1 liter of water.
Bring to a boil. Reduce heat and leave to cook until pumpkin slices are soft.
Mix vegetables with a hand blender and pour in your verrines. Serve immediately.