This is one of the great table sauces of Mexico. The crisp, fresh flavors of the tomatillos, cilantro (fresh coriander), and chiles make a wonderful accomaniment to tacos de carnitas or grilled (barbecued) meat. One of the most simple ways to enjoy it is in a hot tortilla with nothing more than a little queso panela or fresh farmers chese. Canned tomatillos cannot be substituted in this recipe.