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.
Notes
Makes 2 cups total.
Adjust the spice level. To make it mild, remove the seeds from all of the jalapeños. To make it medium-hot, remove the seeds from only some of the jalapeños. To make it extra spicy, use serrano peppers instead of jalapeños. Blend just 1 pepper at a time until you reach the desired level of spice.
To add even more depth of flavor, try lightly frying the blended salsa in 1 tablespoon of olive oil! I grew up eating it this way, and it's so good! Adjust the consistency.
If your salsa is too thick, add 1 tablespoon of water at a time to the blender until it's your desired consistency.
Salt to taste. Add in more salt one pinch at a time until it's just right.