How It's Made: Bourbon

Bourbon Whiskey: A Distinctively American Spirit

The Origins and Definition of Bourbon

• Bourbon whiskey is recognized by the US Congress as a uniquely American product, originating from Scottish and Irish settlers in late 18th-century Kentucky.

• By law, bourbon must be made from a grain mix that is at least 51% corn, with many distillers opting for higher percentages to enhance flavor.

The Production Process

Grinding and Cooking

• Corn kernels are sifted to remove foreign materials before being ground in rollers to release starch flavors; larger chunks of corn germ and husks remain post-grinding.

• The ground corn is cooked with iron-free Kentucky water, along with malted barley and soft red winter wheat, creating a mash that includes some mash from previous batches.

Fermentation

• The mixture flows into cypress wood fermentation tanks where yeast converts sugars into alcohol over eight to ten hours, resulting in a bubbling brew known as "distillers beer."

• After three days of fermentation, the liquid thickens before being distilled in a column still which separates alcohol vapor from water and other substances.

Distillation and Aging

• Following a second distillation, the alcohol concentration reaches 130 proof; this clear liquid is referred to as "white dog." Water is then added to dilute it to 110 proof before lab testing for flavor compounds and strength.

• Once approved, the bourbon is transferred into new charred oak barrels which caramelize wood sugars during aging, imparting sweetness and color over time.

Bottling Process

Aging and Final Preparation

• Bourbon ages for several years in multi-tiered warehouses; barrels are moved between levels to ensure consistent aging due to temperature variations. After six or seven years, ambient air is introduced through steel tubes for optimal flow when bottling begins.

• Before bottling at 90 proof, nozzles fill bottles which are capped with metal caps applied by machines; labels are affixed smoothly using brushes while caps receive hot wax for better sealing after bottling completion.

Conclusion

• After extensive aging within the distillery process, Kentucky bourbon emerges ready for consumption—a testament to its rich heritage and meticulous production methods. A toast signifies its readiness!