Preheat your oven to broil, ensuring it’s at its hottest setting. Roast the ingredients for about 7–10 minutes, watching closely until the tomatillo skins blacken and soften.

Put the tomatillos on a foil-lined baking pan and roast in the oven, turning them over once halfway through, until their tops and bottoms have blackened and the tomatillos are a khaki-green color ...