Preheat the oven to 450 degrees. Line a large rimmed baking sheet with foil and add the tomatillos, garlic and onion. Roast for 10 to 15 minutes or until juicy. Let cool slightly.
In a food processor or blender, combine the roasted tomatoes, onion and garlic with remaining ingredients. Pulse until blended to desired consistency.
Refrigerate until ready to eat. Dig in!