Whether you choose the verdant, slushy, herby freshness of the all-raw tomatillo salsa or the oil-colored, voluptuous, sweet-sour richness of the roasted version, tomatillos are about brightening tang. The buzz of the fresh hot green chile adds thrill, all of which adds up to a condiment most of us simply don't want to live without.
For the All-Raw version: Roughly chop the tomatillos and the chiles. In a blender or food processor, combine the tomatillos, chiles, cilantro and 1/4 cup water. Process to a coarse puree, then scrape into a serving dish. Rinse the onion under cold water, then shake to remove excess moisture. Stir into the salsa and season with salt, usually a generous 1/4 teaspoon.
For the Roasted version:
Preheat a broiler.
Roast the tomatillos and chiles on a baking sheet 4 inches below a very hot broiler until darkly roasted, even blackened in spots, about 5 minutes. Flip them over and roast the other side, 4 to 5 minutes more will give you splotchy-black and blistered tomatillos and chiles. In a blender or food processor, combine the tomatillos and chiles, including all the delicious juice that has run onto the baking sheet. Add the cilantro and 1/4 cup water, blend to a coarse puree, and scrape into a serving dish. Rinse the onion under cold water, then shake to remove the excess moisture. Stir into the salsa and season with salt, usually a generous 1/4 teaspoon.