This is my recipe based on Rick Bayless's. His has raw diced onion which I do not like.
Roasted Tomatillo Salsa
Salsa Verde
Makes about 1 cup
Ingredients
8 ounces (3 to 4 medium) tomatillos, husked and rinsed
Fresh hot green chiles to taste (1 or 2 serranos or 1 jalapenos), stemmed
1/4 small white onion
2 large garlic cloves, peeled
6 sprigs of fresh cilantro (thick bottom stems cut off), roughly chopped
Salt
Squeeze of lime
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Directions
Roast the tomatillos, chile(s), onion and garlic on a rimmed baking sheet 4 inches below a very hot broiler, until blotchy black and softening (they’ll be turning from lime green to olive), about 5 minutes. Flip them over and roast the other side. Cool, then transfer everything to a blender, including all the delicious juice the tomatillos have exuded during roasting. Add the cilantro and squeeze of lime, then blend to a coarse puree. Add water to get preferred consistency.