Wash the jalapeños & tomatillo - take the leaf off of the green tomatoes.
Add jalapeños and tomatillo in to a sauce pan with water. Put over med heat.
Bring to boil. Remove and set aside.
Put cilantro, garlic, salt and onion in a blender along with the jalapeño and tomatillo.
Add water to blender (Hint: use water from sauce pan. About a ladle or two) blend until smooth (about two mins)
Put in a tuba war or salsa dish.
If using for Enchilladas. It's fine as is. If using for Chilequiles then add in a sauce pan and let come to a simmer along with a bay leaf or two or some mint.