Make a hot fire with hardwood fire wood, or a gas grill.
Remove husks of tomatillos. Peel the onion and cut in half, leaving the root end attached.
Cook the tomatillos, jalapeno, onion, and scallions over the fire until a good level of blackened, charred bits are visible. The scallions will have the shortest cooking time.
Remove the stem and seeds from the jalapeno
Add all ingredients into a food processor and blend to your desired consistency