Cinco de Mayo is today. I am sure many an American reader will take the opportunity to savor some Mexican tequila.
I began my career at Mexico’s only stainless steel mill, Mexinox (now part of the Finnish company Outokumpu), which supplied tequila distilleries with the stainless steel used for fermentation and storage tanks. Tequila is a quintessential Mexican drink and was enjoyed by many a customer visiting the Mexinox plant (off-site, of course).
After a tour of the plant, it was only appropriate that we gave our customers commemorative bottles of Mexinox-branded El Gran Viejo Tequila to bring back home to the States. I thought it would be interesting to examine just how stainless is used in tequila production.
Why is stainless steel in tequila production? Of course, stainless vats are a sanitary choice; however, stainless does not impart any additional flavors into the mixture of blue agave juice and the distinctive water called the mosto.
Tequila is distilled twice in accordance with Mexican law. Because no leeching occurs in either the fermentation or distillation process when stainless is used, the resulting tequila “blanco” is clear in color and solely the result of the fermentation of the agave juice and spring water.
The addition of proprietary yeast — and classical music in some cases, finishes out the blend.
A former colleague of mine shared that Cazadores plays classical music in the fermentation room because the sound waves create a soft stirring in the tanks that aides in the fermentation process. Many people describe the resulting tequila after two distillation processes as being light with citrus or aloe vera notes. Blanco tequila is aged less than two months in stainless barrels and then bottled. The darker colored tequilas are those that have been aged in oak barrels which means the tequila takes on the flavors of the wood and the harshness of the alcohol mellows.
Anejo or Reposado?
Reposado is aged two months to under a year, and anejo is aged from one to three years. Once the aging is complete, the tequila can then be stored in stainless tanks again until it is bottled.
Stainless steel is a neutral container that allows the natural elements of the blue agave to be fully experienced. The soil and climate have an impact on the taste of the blue agave hearts.
Tequila from the lowland blue agaves is described to have an earthy flavor whereas the highland blue agaves yield sweeter and fruitier flavors. The other factor in the taste of the finished product is the water which is combined with the blue agave juice.
Just as bourbon has a unique taste because of the limestone in the Kentucky water, tequila has a special taste because the regional water is high in mineral content. Stainless steel allows all of these factors of Mother Nature to mix together to create a unique tequila without adding any of its own character. By the way, Mother Nature had a way of bringing tequila to us, supposedly, by a farmer’s wife seeing a rabbit gnawing on a fermented agave plant, according to the Suerte website. I suppose it was luck “suerte” that brought tequila to civilization.