Heat a large cast iron skillet or comal over medium heat.
Add the tomatillos, onion, jalapeños, and garlic and dry fry until all the vegetables are nicely charred, about 15 minutes, turning frequently. The garlic will char first, remove it when it is golden brown to prevent from burning.
Peel the skin off the garlic. Transfer charred vegetables to a blender and add remaining ingredients. Blend on high until puréed and smooth.
Dip a chip into the salsa. It should run off the chip. If it is too thick and gloppy add more water, 14 cup at a time until it is the right consistency. Taste and add more salt as needed.
Serve immediately with chips or transfer to a container, cover, and refrigerate for up to a week.