Step 1

Place a rack in middle of oven and preheat to 350°. Toss squash, garlic, sage, thyme, oil, and salt in a shallow 2-qt. baking dish to combine.

Step 2

Turn garlic cut side down, then roast vegetables, tossing 2 or 3 times, until golden brown, very tender, and edges and cut sides are crisp, 60–70 minutes. Let cool slightly, then add vinegar and toss to coat.