Wednesday, July 29, 2009

Tequila : Distillation, Classification and Aging

Distillation and Aging
Traditionally Tequila and Mezcal have been distilled in pot stills to 110 proof (55% ABV). The resulting spirit is clear, but contains a significant amount of congeners and other flavor elements. Some light-colored Tequilas are now being re-distilled in column stills to produce a cleaner, blander spirit.
Color in Tequila and Mezcal comes mostly from the addition of caramel, although barrel aging is a factor in some high-quality brands. Additionally, some distillers add small amounts of natural flavorings such as Sherry, prune concentrate, and coconut to manipulate the product's savor profile. These added flavors do not stand out themselves, but instead serve to smooth out the often hard-edged palate of agave spiritS.
Classifications
Beyond the two basic designations of Tequila—agave and mixto—there are four categories: Silver or Blanco/White Tequilas are clear, with little (no more than 60 days in stainless steel tanks) or no aging. They can be either 100% agave or mixto. Silver Tequilas are used primarily for mixing and blend particularly well into fruit-based drinks.
Gold Tequila is unaged silver Tequila that has been colored and flavored with caramel. It is usually a mixto.
Reposado ("rested") Tequila is aged in wooden tanks or casks for a legal minimum period of at least two months, with the better-quality brands spending three to nine months in wood. It can be either 100% agave or mixto. Reposado Tequilas are the best-selling Tequilas in Mexico.
AƱejo ("old") Tequila is aged in wooden barrels (usually old Bourbon barrels) for a minimum of 12 months. The best-quality anejos are aged 18 months to three years for mixtos, and up to four years for 100% agaves. Aging Tequila for more than four years is a matter of controversy. Most Tequila producers oppose doing so because they feel that "excessive" oak aging will overwhelm the distinctive earthy and vegetal agave flavor notes.

Mezcal and the Worm
The rules and regulations that govern the production and packaging of Tequila do not apply to agave spirits produced outside of the designated Tequila areas in Mexico. Some Mezcal distilleries are very primitive and very small. The best known mezcal come from the southern state of Oaxaca (wuh-HA-kuh), although it is produced in a number of other states. Eight varieties of agave are approved for Mezcal production, but the chief variety used is the espadin agave (agave angustifolia Haw).
The famous "worm" that is found in some bottles of Mezcal (con gusano -- "with worm") is actually the larva of one of two moths that live on the agave plant. The reason for adding the worm to the bottle of Mezcal is obscure. But one story, that at least has the appeal of logic to back it up, is that the worm serves as proof of high proof, which is to say that if the worm remains intact in the bottle, the percentage of alcohol in the spirit is high enough to preserve the pickled worm. Consuming the worm, which can be done without harm, has served as a rite of passage for generations of fraternity boys. As a rule, top-quality mezcals do not include a worm in the bottle.

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