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Ingredients
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1 pound whole-grain dried yellow dent corn (such as Great River Organic Milling Whole-Grain Corn) (about 3 cups)
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4 quarts plus about 1 cup water, or more as needed, divided
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1 tablespoon pickling lime (also labeled cal or calcium hydroxide)
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2 teaspoons olive oil (if grinding masa in food processor)
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1 teaspoon kosher salt
Directions
Make the nixtamal
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Place corn in a large bowl, and add water to cover. Stir well with your hands to wash kernels and loosen any corn silk or husk pieces. Drain and set aside. Bring 4 quarts water to a boil in a medium nonreactive stockpot over medium-high. Using a wooden spoon, stir in pickling lime until dissolved. Stir in corn, and return to a boil. Reduce heat to medium-low to maintain a low simmer. Simmer, uncovered, stirring occasionally, until outer layer of corn is slightly cooked but the inner core remains dry and opaque, about 1 hour. Remove from heat. Let corn sit in cooking liquid (called nejayote), covered, at room temperature 12 hours.
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Drain corn in a colander; discard liquid. Rinse corn under running water, rubbing kernels between your fingers and against the colander to remove some of the slimy outer skin. Continue rinsing until the majority of the slippery skin is removed. (Don't worry about removing it from every single kernel.) Drain and discard skins.
To grind masa in a mill
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Set up the mill, and adjust the grinding plates for a fine grind. As you crank the empty mill, the plates should rub against each other with a small amount of constant friction. Place a large bowl below the grinding plates. Working in batches, place the prepared corn in the hopper, and grind, adding water, 1 tablespoon at a time, to lubricate the grinding process, 5 to 6 tablespoons total. Once all of the corn has passed through the mill, working in batches, return the corn mixture to the hopper. Continue grinding, using a wooden tamper or the handle of a wooden spoon to feed mixture into the mill and adding water, 1 tablespoon at a time, to hydrate the dough until mixture has a mashed potato consistency, 8 to 12 tablespoons total. (The texture may be slightly dry and shaggy, but you're well on your way to soft and tender masa.) To grind masa in a food processor: Transfer corn to a salad spinner, and spin to remove excess water. (Drying the corn well is essential for grinding it evenly.) Transfer half of the corn (about 21/2 cups) to a food processor fitted with the steel blade. Pulse until kernels are coarsely chopped, 6 to 8 pulses. Process until corn is very finely ground, 3 to 5 minutes, stopping occasionally to scrape the sides of the bowl and break up if it forms a ball. Transfer mixture to a large bowl. Repeat process with remaining corn, and add ground corn to the bowl with the first batch. Drizzle with olive oil.
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Sprinkle salt over corn mixture. Add water, 1 teaspoon at a time, kneading masa in bowl at least 30 seconds after each addition. Continue adding water and kneading until the texture is similar to Play-Doh, slightly tacky but not too sticky, 10 to 15 teaspoons of water total and about 10 minutes of kneading. It's important to incorporate a small amount of water at a time, allowing the masa to absorb the moisture and gradually become soft and pliable. If it feels a little dry, add more water, but only 1 teaspoon at a time to avoid overhydrating it. If it gets too sticky or feels too wet, let masa stand, uncovered, 20 minutes; gently knead to achieve a drier texture. To test if the dough is properly hydrated, form a golf ball–size ball in your hands. Press between your palms to flatten to a 1/2-inch-thick disk. The dough along the edges should be smooth; if it cracks, continue adding water and kneading. If the masa doesn't release cleanly from your palms, it is too wet.
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Cover bowl with a damp kitchen towel to prevent surface of masa from drying out. Use immediately, or let stand at room temperature up to 4 hours. If it dries out, dip your hands in water, and gently knead to add more moisture until the masa is soft, tender, and pliable.
Make Ahead
Masa can be wrapped tightly in plastic wrap and stored in refrigerator up to 4 days.