How to Make It
Preheat broiler with oven rack 6 inches from heat. Arrange tomatillos, chiles, and onion in a single layer on a rimmed baking sheet. Broil until tomatillos are soft and browned, 15 to 20 minutes, turning after 8 minutes. Cool 10 minutes.
Transfer vegetables and any liquid in pan to a blender. Add cilantro, 1/2 cup water, oil, juice, honey, and salt; process until almost smooth. Keep at room temperature until ready to serve (up to 2 hours), or store, covered, in refrigerator up to 1 week.