Methods/steps

In a bowl, soak the chiles in hot water until soft, about 4 hours. Remove the seeds and stems.

In a food processor or blender, combine the chiles, onion, garlic, olive oil, sesame seeds, peppercorns, cumin seeds, cinnamon stick, Mexican oregano, and salt and process to a paste.

Heat the olive oil and vegetable oil together in a saucepan and fry the paste over medium heat until it is aromatic, stirring constantly for about 5 minutes. Add the vinegar and water, remove from the heat, and stir well.