Want To Know How Whisky Is Made, Exactly? Here’s A Breakdown Of The Process

Whisky is more than a golden-hued, exquisite-looking spirit added to cocktails or to a Glencairn glass for tasting. A lot goes into making the perfect whisky, whether it is a single malt, a blended Scotch or an American bourbon. And this process of whisky-making is what sparks the curiosity of many amateurs new to the realm of this spirit. From the grains used for making whisky to the process of malting, mashing, fermentation, and even distilling, there is a lot involved in preparing this fine spirit. 

Here’s a look at some of the processes involved in the production of whisky, right from the first step to the final bottling:

Whisky requires three ingredients for its making, namely, grains, yeast and water. Barley, corn, rye and wheat are the commonly used grains for making malts and blended whiskies.

As the type of whisky changes, so do the grains used for making whisky. Barley is used for making single malt, corn is used to make American bourbon and malted blends are brought together for making blended Scotches.

Malting is the process that is followed while using barley to typically make Scotch whisky. This involves soaking barley in water, allowing it to germinate. The process converts starches into fermentable sugars. Once the barley is malted, it is dried in a kiln, which develops its colour and lends it a smoky flavour. Malt whisky makers diligently follow this step, whereas others might skip it. 

For malted whiskies as well as other whisky variations, this step, which comes after malting, involves grinding grains and then mixing them in hot water. This extracts sugars from them to form a liquid called the wort.

Once mashing is complete, the next step in the process is fermentation. This involves adding yeast to the mashed mixture, which produces flavour compounds and works on the extracted sugars such that the grains slowly begin to show the first signs of being transformed into whisky. This process, called the ‘wash’, may take about 2 to 5 days.

One of the most important steps involved in whisky making, distillation concentrates the flavours and alcohols in the whisky. The fermented mixture is heated, and alcohol and flavour compounds are separated through evaporation and condensation for more concentrated and refined tasting notes.

There are two kinds of distillations:

– Pot stills: a batch process used for making single malts and Irish whiskies, for developing richer flavours

– Column stills: a continuous process used for making bourbons, blends and grain whiskies, for developing cleaner and lighter spirits

After distillation, the next step is maturation. Whisky is filled in oak barrels and aged for at least 3 years. This is the process in which whisky gets its colour from the cask woods, absorbs the more complex flavour compounds such as vanilla, spice, caramel and smoke and gets rid of some of its harsher notes.

Casks used for maturation are what lend whiskies their complex flavour profiles. Barrels which once held bourbon are complete with vanilla-like, caramel notes, whereas sherried casks carry a dried fruity, nutty richness. Each of these casks lends the finishing touches to the tasting notes of whisky, making them very important in the whisky-making process.

Before bottling, whisky is filtered, diluted and sometimes even mixed with other whiskies in the case of blended spirits. Some whiskies are non-chilled-filtered for better flavour retention.

Barring certain regional variations, all whiskies follow these basic steps in their making. Some differences do emerge, such as Scotch whiskies using malted barley, and Irish whiskies being triple-distilled for smoothness. Bourbon is aged in new charred oak barrels, and Indian whiskies need ageing for a much shorter duration.

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