Nixtamalization is the ancient process of cooking dried corn with an alkali. It softens the hull, unlocks nutrients, and creates the flavor and aroma that separate fresh masa from bagged masa harina. It takes one pot and one overnight rest.
What you need
- Dried field corn, also called maiz cacahuazintle or dent corn. Sweet corn will not work.
- Cal, or food-grade calcium hydroxide, sold as pickling lime.
- A non-reactive pot: stainless steel, never aluminum.
The ratios
For every 1 kg of dried corn, use about 1 percent cal by weight, so roughly 10 g, and 3 liters of water. Precision matters less than consistency; too much cal makes the masa soapy and yellow.
The process
- Rinse the corn and remove floaters and debris.
- Dissolve the cal in cold water, add the corn, and bring to a boil.
- Simmer 15 to 45 minutes depending on the corn. Test by rubbing a kernel: the skin should slip off easily.
- Turn off the heat and steep 8 to 14 hours, or overnight.
- Drain and rinse well, rubbing the kernels to remove the loosened hulls. Rinse until the water runs clear.
Grinding
A hand-cranked corn mill or a countertop wet grinder produces the best texture. A powerful food processor gets you a coarse but usable masa; add water a tablespoon at a time. Good masa feels like soft play dough and does not crack at the edges when pressed.
Storage
Fresh masa keeps two days refrigerated and freezes for three months. Nixtamalized corn before grinding, called nixtamal, keeps three days in water in the refrigerator.
Is it worth it?
For everyday tacos, good masa harina is fine. For a weekend project, fresh nixtamal tortillas taste like a different food entirely: sweeter, more aromatic, and noticeably more tender.
Pair this with our homemade corn tortilla recipe for the pressing and cooking steps.
