This recipe from Patricia Quintana is a delightful dish that is special enough to serve at an important meal while at the same time being quite straightforward to prepare. It displays a quartet of Mexico's most important ingredients-cuitlacoche (corn fungus), epazote leaves, wild mushrooms, and several kinds of chiles-to their best advantage. Meztli means "moon" in Nahuatl, and the pale sauce atop the black one is meant to signify the moon shining on a dark night.