Note from Ricardo Get a head start and cook a medium-sized squash up to 2 days before making the soup. With the rack in the middle position, preheat the oven to 400°F (200°C). Line a baking sheet with a silicone mat or parchment paper. On a work surface, cut the squash into rounds about 2 inches (5 cm) thick. Remove and compost the seeds. Lightly oil the squash. Season with salt and pepper. Place the squash slices on the baking sheet. Bake for 35 minutes or until tender. Let cool. Using a fork, delicately separate the squash strands.