Preheat oven to 400°
Cut the squash in half lengthwise and remove the seeds with a spoon and discard them.
Slice off the top and the bottom of the squash and discard.
Using a large vegetable peeler, stand the squash up and peel off and discard the outside skin.
Cut the squash into large chunk pieces and place them in a bowl.
Toss them with the olive oil and salt and pepper.
Spread them out on a parchment paper-lined cookie sheet and bake them for 30 minutes.
Remove the squash from the oven and carefully (they will be very hot) put them into a blender or food processor.
Blend until smooth.