Guajillo chiles are the dried version of a Mirsaol chile. They are narrow and long with shiny, smooth, reddish-brown walls. Guajillo peppers are an essential part of Mexican cooking. They have a zingy spice with notes of pine and cranberry. The fruity, tangy flavor is often described as sweet with notes of berries and tea. The chiles have a medium spice at 2,500-5,000 SHU.