Spread the puree on pizza dough for an unconventional sauce, or enrich it with a bit of butter and serve it as a side dish for chicken, pork, or lamb.
Preheat oven to 400 degrees. Spread squash in a single layer on a rimmed baking sheet. Toss with oil, and season with salt and pepper. Roast until golden and tender when pierced with a paring knife, about 45 minutes. Remove from oven.
Transfer squash to the bowl of a food processor; puree until smooth. Season with salt and pepper. Set aside at room temperature until ready to use.