Many good ideas...
If it's winter, only a few vegetables are still standing. So I ll go with a "butternut squash Velouté".
I boil the squash in water with a potato and an onion stuck with a clove.
The potato is for its effect on the smoothness of the soup when mixing.
The onion is for the taste.
I drain it in a strainer, while keeping one big glass of the boiled water.
Then everything goes in a blender. Only a blender can give it a smooth texture.
I did put butternut squash because I don't know how to say Potiron in english.