
Remove the stems and seeds from the guajillo & arbol chiles.
In a medium saucepan, add the chiles, garlic cloves, onion, 4 cups water and 1 teaspoon salt.
Bring the water to a boil then reduce the heat to low. Simmer for about 10 minutes or until the guajillo chiles are soft.
Remove from the heat and let it cool for 10 minutes. Reserve 1 cup of the hot water.
In a blender, add all of the ingredients with 1 cup of the chile water. Add the other 1 teaspoon salt, the cumin, oregano and black pepper. Puree until smooth. About 2 minutes.