Pasilla Chile and Tomato SaucePasilla (or pasilla negro) chiles are dried black chiles that are called chilacas when they are fresh and are widely grown in central Mexico. The name pasilla is also given to ancho and poblano chiles in some parts of the United States, so be careful when selecting chiles. (I use the names I learned in Mexico.) Ancho or mulato chiles could be substituted for this sauce, but the flavor will be quite different. Serve as a table sauce or spoon over grilled fish or chicken.