Remove the skin from the tomatillos and wash them under cold running water. You will notice that a foam comes out but it is normal.
There are people who wash tomatillos with soap, but because of the foam, I prefer to wash them only with cold water.
Remove the skin from the garlic cloves.
Wash the cilantro, cut the roots and set aside.
Place water in a pot and add the tomatillos, chiles, onion and garlic cloves.
Let cook everything for ten minutes or until the chiles and tomatillos are cooked. (they will soften and change color).
Put everything except the water in the blender.
Add cilantro and salt.
Blend and check the thickness of your green sauce. If it is very thick, you can add some of the water where we cooked the ingredients little by little until you achieve the consistency you want.
Some people add lemon but for me, this is the best salsa verde for tacos, tostadas, chips, anything you want!