2Clean the dried chile guajillo, chile ancho, chile pasilla, and chile de árbol by removing stems and seeds. Rehydrate the chiles in hot water for 20 minutes until softened.
3Toast the cumin seeds, Mexican oregano, thyme, marjoram, black peppercorns, and whole cloves in a dry pan over medium heat until fragrant, about 1-2 minutes. Be careful not to burn them.