Masa is a unique corn dough that’s the basis for both tamales and tortillas. More than just a simple combination of ground corn and water, it’s actually made from corn that’s been nixtamalized. That’s quite a mouthful of a word, and it refers to corn that’s been treated with a weak alkaline solution. It comes from the Aztec word “nixtamal” which, loosely translated, means “ash dough.”
Not very appetizing by the sound of it. However what ancient Mesoamericans discovered 3,500 years ago is that when you boil and then soak raw corn kernels together with ashes, some very interesting things happen. Most noticeably, the outer hulls (pericarps) of the kernels loosen to the point that they can be slipped off.
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