Preheat the oven to 400 degrees F (200 degrees C).
Lay the habaneros, garlic and onions on a baking tray lined with parchment paper. Drizzle with olive oil and sprinkle with salt. Bake in the oven until all the vegetables have a nice char, about 30 minutes.
Transfer into the recipient of the food processor and reduce into a coarse puree with the cilantro. Add the vinegar and season with salt.
Recipe courtesy of Chuck's Week Off: Mexico