Green Enchilada Sauce

Preheat oven to 425 degrees F.

Place tomatillo halves (cut-side up) and chiles on a large rimmed baking sheet. Roast, turning chiles once, until the tomatillos are soft and the chiles have char marks on both sides, 25 to 35 minutes.

Meanwhile, heat oil in a large saucepan over medium heat. Add onion, garlic, cumin, oregano and salt; cook, stirring, until softened and starting to brown, about 5 minutes. Remove from the heat. Transfer to a blender.

When the tomatillos and chiles are done roasting, add them to the blender with the onion mixture; puree. Pour the puree into the saucepan and stir in broth. Bring to a simmer. Cover and cook at a lively simmer, stirring often and reducing the heat if necessary, until thickened, 20 to 25 minutes. If the sauce tastes too tangy, stir in a little sugar.