To roast the salsa: Add the tomatillos, jalapeños, and garlic to a large baking sheet. Roast directly under the broiler for 10 minutes, flipping halfway through, until the tomatillos and peppers are charred.
To boil the salsa: Add the tomatillos, jalapeños, onion, garlic, and enough water to completely cover them to a medium pot. Bring to a boil, reduce the heat to low, cover, and simmer for 6-8 minutes until the tomatillos and peppers turn from a bright green to a dull and dark yellow-ish camouflage green.
Add the tomatillos, jalapeños, onion, garlic, cilantro, lime juice, and salt to a large blender and blend until smooth.
Serve immediately or store in the refrigerator for up to 1 week.
