The process necessary is ECN-2, which has an initial step using an alkaline bath to remove the backing layer.
2.
But it can be eaten, and might even be pretty good, if you first soak the kernels in water mixed with something alkaline . ( Lime, or calcium hydroxide, is traditional, ashes even more so . ) An alkaline bath loosens the tough hulls so they can be rubbed off, leaving hominy, or posole.
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