Guajillo Chili, generally 2 to 4 inches long. This dried chile is widely used in Mexican sauces and cooking. Their flavour is deeply aromatic. MexGrocer.co.uk has a broad range of whole dried Guajillo Chili. Guajillos are smooth, shiny, and reddish-brown with a medium heat. Because they have a tough skin you will need to soaked them in water slightly longer than other chiles. The seeds from guajillo chiles are used to make tamale salsa. The process involves grinding them to make a paste and then cooking them to make a red sauce.