Husk and rinse 1 ½ pounds tomatillos and lay them on a baking sheet pan. Heat the broiler to HIGH and roast for about 10 minutes, turning halfway through. Remove from the oven and let cool.
In a food processor or blender, add the roasted tomatillos, 1 small chopped white onion, 2 jalapeño peppers, 3 garlic cloves, ½ cup cilantro, and salt to taste.
Pulse until it reaches the desired consistency. Serve with chips or as a topping on your favorite Mexican dishes.