How to Make It
Preheat oven to 400ºF. Line a baking sheet with heavy-duty aluminum foil. On baking sheet, toss squash with oil and 1/4 tsp. salt to coat. Spread squash in a single layer and roast until soft, stirring occasionally, about 25 minutes.
Bring a large pot of salted water to boil. Cook spaghetti until just tender, about 10 minutes, or as package label directs. Drain, reserving 1/2 cup of pasta cooking water. Return spaghetti to pot and add squash, butter and sage. Stir, adding pasta water as necessary to moisten. Serve immediately, topping with Parmesan.
Also appeared in: All You, February, 2012