Heat the oil and melt the butter in a large pot over medium heat. Cook and stir the onion in the butter and oil until tender.
2
Mix the carrots and squash into the pot. Pour in vegetable stock, and season with salt, pepper and nutmeg. Bring to boil, reduce heat, and simmer until vegetables are tender.
3
In a blender or food processor (I use imersion hand blender) puree the soup mixture until smooth. Return to pot and stir in 1/2