Dried maize meets alkaline water — traditionally from hardwood ash, today often food-grade lime (calcium hydroxide). The hull loosens. The grain softens. Nutrients become more available. What cooks call “proper masa” is the sensory result of that ancient chemical conversation.
After soaking and washing, the nixtamal is ground. Texture matters: too fine and the tortilla may turn pasty; too coarse and it cracks. Fresh masa behaves differently under a comal than masa from a refrigerated bag. It freckles. It puffs. It announces itself.
The urban mill
In Mexican cities, the molino remains infrastructure. Neighbourhoods organise mornings around it. Restaurants that care about tortillas either mill, partner with millers, or accept a compromise they can taste. The sound of the grind is part of the city’s food soundtrack — as ordinary and as essential as a bakery oven elsewhere.
Technique is democratic: you do not need a reservation to learn how heat transforms maíz.
Why craft essays matter
Writing about nixtamal keeps Mexican gastronomy anchored in process rather than prestige. Mole essays need this foundation. Market essays need it. Even institutional dining rooms that become cultural reference points keep returning to masa when they want to speak about origin.
Maíz & Mole ends — and begins — with craft because craft is where culture becomes edible. The tortilla is small. The system behind it is not.