Peel and clean the tomatillos. Wash the chiles and cut the stems off. Place the tomatillos and chiles in a pot and cover with water. Bring to a boil and then cook for about 10 minutes. You will know when they are done when they change from a bright green to an olive green. Let them rest to cool down.

Strain them but keep the liquid and set apart. In a blender combine tomatillos, chiles, onion, a large handful of cilantro and salt to taste. Mix, taste for salt and consistency, if it is too thick, add a little bit of the liquid you set apart. That's it!