On a heat scale from 1 to 10, with 10 being the hottest, Guajillo Peppers rate 6. Use in sauces and stews. U.S. origin. Pronounced [gwah-HEE-yoh] This is simply the dried whole chili, ground up into a fine powder. Use in recipes that call for guajillos and you don’t want to take the time to use dried whole chiles.