Preparation Place a rack in middle of oven and preheat to 350°F. Toss scallions, garlic, ginger, chiles, oil, and salt in a shallow 2-qt. baking dish to combine. Turn garlic cut side down, then roast vegetables, tossing 2 or 3 times, until golden brown, very tender, and crisp around edges, 60–70 minutes. Let cool slightly, then add vinegar and toss to coat.
Preparation Place a rack in middle of oven and preheat to 350°F. Toss scallions, garlic, ginger, chiles, oil, and salt in a shallow 2-qt. baking dish to combine. Turn garlic cut side down, then roast vegetables, tossing 2 or 3 times, until golden brown, very tender, and crisp around edges, 60–70 minutes. Let cool slightly, then add vinegar and toss to coat.