The toasting of the dried chiles is very important—in fact, it is the key to turning out a true black mole.
When blending the chiles and nut mixture, a high-speed blender like a Vitamix is ideal, but if that isn’t available, blend the chiles in a couple of batches, letting the machine run long enough to create as silky a puree as possible.
Balancing flavors with salt and sugar takes a bit of experience.
Watch the video
https://www.youtube.com/watch?v=Zwgsbzcl5j8