How is mezcal made?

Mezcal is a wood-roasted, copper-distilled, agave-based spirit from Mexico – but that summary collapses what is one of the longest production processes in commercial alcohol. A bottle of artesanal mezcal represents somewhere between eight and twelve years of biological labor and three to four weeks of intensive human work before it ever reaches a glass. Shortcut versions exist; the long versions are what mezcal critics mean when they use the word.

It starts with the agave. The plant grows for eight to twelve years (cultivated espadín) or fifteen to thirty years (wild agaves like tobalá or tepextate) before it produces a single seedstalk – the quiote. The plant is harvested before that stalk fully emerges, which kills the agave but concentrates the sugar inside its core. The harvested core, called the piña because it looks like a four-foot pineapple, is what gets cooked.

The roasting is what makes mezcal mezcal. A pit oven (horno) is dug into the ground, lined with river stones, and fueled with hardwood – typically oak, mesquite, or huizache. The wood is burned down to coals, the rocks heated to roughly 600-800°F, the piñas piled on top and covered with leaves and earth. The agave roasts for three to five days. This is where the smoke, the caramelized sugar, and the cooked-plant character all enter the spirit. Industrial mezcal uses autoclave steam ovens to get the same sugar conversion in twelve hours; the result is technically still mezcal under Mexican law but tastes nothing like the wood-roasted version.

Once cooked, the piñas are crushed. Three methods dominate: a tahona (a stone wheel turned by a horse or mule, the slowest), a wooden mallet (the most ancestral), or a mechanical shredder (faster, used by most producers today). The choice affects texture more than flavor – mechanically shredded agave ferments faster but loses some of the structural complexity that slow milling preserves.

Fermentation happens open-air in wooden vats called tinas. The producer adds water, sometimes nothing else, and lets ambient yeast do the work. Three to ten days, depending on temperature and humidity. There is no climate control. There is no commercial yeast strain. The fermentation in a Matatlán palenque tastes different from the fermentation in San Baltazar Chichicapam ten miles away because the air is different.

Distillation comes next, and this is where the equipment varies most. Serious producers use copper pot stills, often Filipino-style, with two distillations – one to extract the alcohol, one to refine. The most ancestral producers use clay pots over open fire, which produces a noticeably more textured spirit. Industrial producers use stainless steel column stills, which is what gets you commercial mezcal that drinks like vodka with smoke flavoring.

After distillation, the spirit is cut to bottling proof – almost always with a tail of the next distillation rather than with water. This is the difference between a bottle labeled 'punta' (the heart of the distillation, untouched) and one stretched to 38-40% with water for a price-point. Bottling proof is one of the clearest signals of producer intent: 45-55% means the producer respected what they made; under 42% usually means a marketing decision.

There is no aging requirement for mezcal – most of the category is bottled within weeks of distillation. The 'reposado' and 'añejo' age categories exist but are mostly imposed by the tequila playbook; serious mezcal makers and drinkers consider extended barrel aging a category drift away from what makes mezcal interesting.

From planting to glass, an artesanal mezcal represents about a decade of plant biology and a few weeks of intensive human labor. The short version of the answer ('agave gets cooked, fermented, and distilled') is technically true but tells you almost nothing about why a $35 bottle reads differently from a $135 one. Almost every meaningful difference between mezcal bottles lives in one of the production steps above.