This is a great condiment when you want to kick it up a notch. You can add more or less chili peppers to control the level of heat. You can also remove the ribs and seeds from the peppers to decrease the heat.
Toss all the peppers, tomatillos, onion, and garlic with the olive oil. Put them on the grill or under the broiler until the skin begins to char and then remove from the heat
Remove the tops from the peppers and add them to a large mixing bowl along with the onion, tomatillos, and garlic. With an immersion (stick) blender, process until desired texture is achieved. This can also be done in a food processor or a regular blender.
Add the cilantro, salt and pepper and the juice from the lime to bowl. Stir to combine. Serve alongside chips, or on top of tacos or fries.