Cascabel chiles are round, about the size of a golf ball and they make a rattling sound when you shake them. Guajillo chiles are red, slender and usually about 4 inches long—they look very similar to New Mexico dried red chiles. Now, in Houston I’ve seen guajillo chiles labeled cascabel chiles—so if it’s long and slender and not round, chances are it’s a guajillo chile. These chiles are commonly found at Mexican grocers, all across the US. If you can’t find them, you can substitute ancho chiles, which may be easier to find–I’d use 4.
Summer squash enchiladas | www.homesicktexan.com