Mezcal (also Mescal or Meskal) is a spirit distilled from mash made out of the steamed hearts of various species of agaves. The word Mezcal comes from the Aztec language, the Nahuatl, and means "cooked agave": Mezcalli from metl = agave, ixcalli = cooked. Historically, Mezcal is the general term for all kinds of agave spirits made in Mexico. Since 1994, however, there is a protected denomination of origin for Mezcal.
Mezcal is not the same as Tequila, and the two should never be confused. Technically, Tequila is a form of Mezcal, more properly known as "Mezcal de Tequila”.
The Mexican state of Oaxaca is the official home of Mezcal and a traditional center for Mezcal making in Mexico, producing 60 percent of the country’s Mezcal. Mezcal is another name for maguey plant. Additionally, Mezcal is the generic name for all spirits distilled from the agave, as well as the name of a regional beverage, similar to Tequila, but made mostly in the state Oaxaca. Mezcal is also native to the states of San Luis Potosi, Michoacan, Jalisco, Durango, Morelos, Nuevo Leon, Tamaulipas, and Zacatecas.
Mezcal is made from the agave plant, often referred to as maguey. Its production, according to most recent evidence, pre-dates the Spanish Conquest. Many of today's facilities use the same age-old technique, although some of the tools of the trade have changed. Clay pots originally used for manufacture and storage have been replaced with copper serpentine for distillation, and oak and glass for aging and transporting.
Most Mezcal is produced in the State of Oaxaca, where it is estimated that there are about 5,000 production facilities. Less than 150 of these are members of the regulated association. Most are tiny mom and pop operations serving a local community and its hinterland. Some produce the spirit for distribution primarily in the City of Oaxaca, and a handful caters to the export market. In all, there is a broad range of quality in terms of smoothness, flavor nuances and smokiness. In fact, the well-entrenched tradition of Oaxacans discerning personal palate-worthiness of different Mezcals manifests itself not through sampling store-bought designer bottles with smart labels, but rather through acquiring multi-liter receptacles from towns and villages in different regions of the state.
There are three major reasons for the diversity of Mezcal. Firstly, as is the case with grape varieties in wine production, there is a range of agave suitable for Mezcal production. Secondly, there are microclimates yielding plants with subtle differences based on for example soil composition and length and quality of growing season, again similar to what we find regarding vineyards. Finally, there is significant variation in the means of production as determined by the Mezcalero, or brewmaster. Each decision is crucial in determining the quality of the finished product, beginning with choosing the precise time when the plant is ready for harvest.